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2e+12=8e-6
We move all terms to the left:
2e+12-(8e-6)=0
We get rid of parentheses
2e-8e+6+12=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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