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2e+12=4e+6
We move all terms to the left:
2e+12-(4e+6)=0
We get rid of parentheses
2e-4e-6+12=0
We add all the numbers together, and all the variables
-2e+6=0
We move all terms containing e to the left, all other terms to the right
-2e=-6
e=-6/-2
e=+3
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