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2e-12=7-7e+8
We move all terms to the left:
2e-12-(7-7e+8)=0
We add all the numbers together, and all the variables
2e-(-7e+15)-12=0
We get rid of parentheses
2e+7e-15-12=0
We add all the numbers together, and all the variables
9e-27=0
We move all terms containing e to the left, all other terms to the right
9e=27
e=27/9
e=3
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