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