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7e+20=3e+120
We move all terms to the left:
7e+20-(3e+120)=0
We get rid of parentheses
7e-3e-120+20=0
We add all the numbers together, and all the variables
4e-100=0
We move all terms containing e to the left, all other terms to the right
4e=100
e=100/4
e=25
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