7e-21=19-e

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Solution for 7e-21=19-e equation: 



7e-21=19-e

We move all terms to the left:

7e-21-(19-e)=0

We add all the numbers together, and all the variables

7e-(-1e+19)-21=0

We get rid of parentheses

7e+1e-19-21=0

We add all the numbers together, and all the variables

8e-40=0

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

8e=40

e=40/8

e=5

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