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4e+7=2e+21
We move all terms to the left:
4e+7-(2e+21)=0
We get rid of parentheses
4e-2e-21+7=0
We add all the numbers together, and all the variables
2e-14=0
We move all terms containing e to the left, all other terms to the right
2e=14
e=14/2
e=7
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