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4e+7=2e+1
We move all terms to the left:
4e+7-(2e+1)=0
We get rid of parentheses
4e-2e-1+7=0
We add all the numbers together, and all the variables
2e+6=0
We move all terms containing e to the left, all other terms to the right
2e=-6
e=-6/2
e=-3
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