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(8e+18)+(9e-3)=90
We move all terms to the left:
(8e+18)+(9e-3)-(90)=0
We get rid of parentheses
8e+9e+18-3-90=0
We add all the numbers together, and all the variables
17e-75=0
We move all terms containing e to the left, all other terms to the right
17e=75
e=75/17
e=4+7/17
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