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12e+18=15e+12
We move all terms to the left:
12e+18-(15e+12)=0
We get rid of parentheses
12e-15e-12+18=0
We add all the numbers together, and all the variables
-3e+6=0
We move all terms containing e to the left, all other terms to the right
-3e=-6
e=-6/-3
e=+2
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