-21=4u+

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Solution for -21=4u+ equation: 



-21=4u+

We move all terms to the left:

-21-(4u+)=0

We add all the numbers together, and all the variables

-(+4u)-21=0

We get rid of parentheses

-4u-21=0

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

-4u=21

u=21/-4

u=-5+1/4

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