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8=e+3e=
We move all terms to the left:
8-(e+3e)=0
We add all the numbers together, and all the variables
-(+4e)+8=0
We get rid of parentheses
-4e+8=0
We move all terms containing e to the left, all other terms to the right
-4e=-8
e=-8/-4
e=+2
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