-21=-4u+u

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Solution for -21=-4u+u equation: 



-21=-4u+u

We move all terms to the left:

-21-(-4u+u)=0

We add all the numbers together, and all the variables

-(-3u)-21=0

We get rid of parentheses

3u-21=0

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

3u=21

u=21/3

u=7

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