matlab方程解得问题

>> [a , b]=solve('a/(1+(a/114.333-1)*exp(-7*b))=123.626' , 'a/(1+(a/114.333-1)*exp(- 9*b))=125.786','a','b')
Warning: The solutions are parametrized by the symbols:
z1 = RootOf(z^8 + z^7 + z^6 + z^5 + z^4 + z^3 + z^2 -
(127798765229636238006524800363850360494799*z)/27000000000000000000000000000000000000000 -
127798765229636238006524800363850360494799/27000000000000000000000000000000000000000, z) minus
(RootOf(z^7 +
(6716928068170839000000000000000000000000000000000000000*z^6)/10198337468826088885740118775856699032234516018748560123
+
(276534894403598208959792885693547747066110099414231*z^5)/164986935900637226566258210665340608484210700317871
+
(36419183985622289058000000000000000000000000000000000000000*z^4)/27408253650458566621489302690957832055630962550734988994913
+
(16957905422945603222699216894662160173305926558617*z^3)/7173345039158140285489487420232200368878726100777
+
(218278090627743969391955412614196514665724819706381962801980641216883423615037017958717903486032812293230299318453381049604665905189748380794159*z^2)/496906808743124051893193408495342307322494140114214642287213741432155040938587111929019247438294338120000000000000000000000000000000000000000
+
(505511779411663386992381901988056015966443655835751*z)/164986935900637226566258210665340608484210700317871
-
177089978871465643304805839348991078382385167578823503180517168791676440036008603357368066949194983774936299318453381049604665905189748380794159/496906808743124051893193408495342307322494140114214642287213741432155040938587111929019247438294338120000000000000000000000000000000000000000,
z) union RootOf(z^7 +
(11913243340525887228001116685471392542983633629988511155052280000000000000000000000000000000000000000*z^6)/1397607217404047487554481497557099019006543195356025667825938609829519874675476171113459078940441972641
+
(30317199219900852112934205889002589110483416597181646054578714867857594108836559701074786942159049560*z^5)/1397607217404047487554481497557099019006543195356025667825938609829519874675476171113459078940441972641
+
(24034635497769422170985185274592650064959102704307302219629360000000000000000000000000000000000000000*z^4)/1397607217404047487554481497557099019006543195356025667825938609829519874675476171113459078940441972641
+
(42760146266079157445249446502452283891496624749114670139580115798038724318299674005139640126724299160*z^3)/1397607217404047487554481497557099019006543195356025667825938609829519874675476171113459078940441972641
+
(36367813258847474411923127548476837037434199795390597423299240000000000000000000000000000000000000000*z^2)/1397607217404047487554481497557099019006543195356025667825938609829519874675476171113459078940441972641
+
(55420497140090969802929908992570732338623664373457829083135567057512974431767126610991982050540684760*z)/1397607217404047487554481497557099019006543195356025667825938609829519874675476171113459078940441972641
+
83402839546809172477486578944963965572276929356022302821530883202929167534379531430665488059866006121/1397607217404047487554481497557099019006543195356025667825938609829519874675476171113459078940441972641,
z))
> In solve at 190
a =
1.4991065934487137230636464121983*z1^7 + 0.98735614363570421709215112011694*z1^6 + 2.5126552066446174260391673432801*z1^5 + 1.9919634259497861306957079835197*z1^4 + 3.5439125947301329582288270899116*z1^3 + 3.0141232597481708360532946046186*z1^2 + 4.5931881663552333152088194935304*z1 + 121.24533307919401582791154197014
b =
log(z1)
如何能得到一个简单地数值解？求教