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8e+2=2e+20
We move all terms to the left:
8e+2-(2e+20)=0
We get rid of parentheses
8e-2e-20+2=0
We add all the numbers together, and all the variables
6e-18=0
We move all terms containing e to the left, all other terms to the right
6e=18
e=18/6
e=3
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