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(7e+6)=90
We move all terms to the left:
(7e+6)-(90)=0
We get rid of parentheses
7e+6-90=0
We add all the numbers together, and all the variables
7e-84=0
We move all terms containing e to the left, all other terms to the right
7e=84
e=84/7
e=12
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