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9e-8=e+120
We move all terms to the left:
9e-8-(e+120)=0
We get rid of parentheses
9e-e-120-8=0
We add all the numbers together, and all the variables
8e-128=0
We move all terms containing e to the left, all other terms to the right
8e=128
e=128/8
e=16
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