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124e+40=86e-302
We move all terms to the left:
124e+40-(86e-302)=0
We get rid of parentheses
124e-86e+302+40=0
We add all the numbers together, and all the variables
38e+342=0
We move all terms containing e to the left, all other terms to the right
38e=-342
e=-342/38
e=-9
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