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(3e+2)+55=90

We move all terms to the left:

(3e+2)+55-(90)=0

We add all the numbers together, and all the variables

(3e+2)-35=0

We get rid of parentheses

3e+2-35=0

We add all the numbers together, and all the variables

3e-33=0

We move all terms containing e to the left, all other terms to the right

3e=33

e=33/3

e=11

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