21=e-7

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Solution for 21=e-7 equation: 



21=e-7

We move all terms to the left:

21-(e-7)=0

We get rid of parentheses

-e+7+21=0

We add all the numbers together, and all the variables

-1e+28=0

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

-e=-28

e=-28/-1

e=+28

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