90=30-e

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Solution for 90=30-e equation: 



90=30-e

We move all terms to the left:

90-(30-e)=0

We add all the numbers together, and all the variables

-(-1e+30)+90=0

We get rid of parentheses

1e-30+90=0

We add all the numbers together, and all the variables

e+60=0

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

e=-60

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