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15=8e+42
We move all terms to the left:
15-(8e+42)=0
We get rid of parentheses
-8e-42+15=0
We add all the numbers together, and all the variables
-8e-27=0
We move all terms containing e to the left, all other terms to the right
-8e=27
e=27/-8
e=-3+3/8
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