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12e-15=7e+40
We move all terms to the left:
12e-15-(7e+40)=0
We get rid of parentheses
12e-7e-40-15=0
We add all the numbers together, and all the variables
5e-55=0
We move all terms containing e to the left, all other terms to the right
5e=55
e=55/5
e=11
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