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4e+7=2e+16
We move all terms to the left:
4e+7-(2e+16)=0
We get rid of parentheses
4e-2e-16+7=0
We add all the numbers together, and all the variables
2e-9=0
We move all terms containing e to the left, all other terms to the right
2e=9
e=9/2
e=4+1/2
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