4e=21+e

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Solution for 4e=21+e equation: 



4e=21+e

We move all terms to the left:

4e-(21+e)=0

We add all the numbers together, and all the variables

4e-(e+21)=0

We get rid of parentheses

4e-e-21=0

We add all the numbers together, and all the variables

3e-21=0

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

3e=21

e=21/3

e=7

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