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72=-8-2e
We move all terms to the left:
72-(-8-2e)=0
We add all the numbers together, and all the variables
-(-2e-8)+72=0
We get rid of parentheses
2e+8+72=0
We add all the numbers together, and all the variables
2e+80=0
We move all terms containing e to the left, all other terms to the right
2e=-80
e=-80/2
e=-40
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