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8e+15=3e-20
We move all terms to the left:
8e+15-(3e-20)=0
We get rid of parentheses
8e-3e+20+15=0
We add all the numbers together, and all the variables
5e+35=0
We move all terms containing e to the left, all other terms to the right
5e=-35
e=-35/5
e=-7
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