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2e-12=7e+
We move all terms to the left:
2e-12-(7e+)=0
We add all the numbers together, and all the variables
2e-(+7e)-12=0
We get rid of parentheses
2e-7e-12=0
We add all the numbers together, and all the variables
-5e-12=0
We move all terms containing e to the left, all other terms to the right
-5e=12
e=12/-5
e=-2+2/5
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