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(7e+6)+(8e-6)=90

We move all terms to the left:

(7e+6)+(8e-6)-(90)=0

We get rid of parentheses

7e+8e+6-6-90=0

We add all the numbers together, and all the variables

15e-90=0

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

15e=90

e=90/15

e=6

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