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7+57=e-42
We move all terms to the left:
7+57-(e-42)=0
We add all the numbers together, and all the variables
-(e-42)+64=0
We get rid of parentheses
-e+42+64=0
We add all the numbers together, and all the variables
-1e+106=0
We move all terms containing e to the left, all other terms to the right
-e=-106
e=-106/-1
e=+106
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