-21=-5+u/4

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Solution for -21=-5+u/4 equation: 



-21=-5+u/4

We move all terms to the left:

-21-(-5+u/4)=0

We add all the numbers together, and all the variables

-(u/4-5)-21=0

We get rid of parentheses

-u/4+5-21=0

We multiply all the terms by the denominator


-u+5*4-21*4=0

We add all the numbers together, and all the variables

-1u-64=0

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

-u=64

u=64/-1

u=-64

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