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2*x-(12/3) = (2*x)/5
(31.79*0.92^2+0.92*172.388)*((x*((65.58*x+2*172.388+172.388)/(65.58*x+172.388+172.388)))/3)-186.17*0.92 = 0
(e^x-1)/(e^x+1)
(31.79*0.92^2+0.92*172.388)*((x*((31.79*x^2+172.388*x+2*172.388)/(31.79*x^2+172.388*x+172.388+172.388)))/3)-186.17*0.92 = 0
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