21=-4+u/5

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



21=-4+u/5

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

-u/5+4+21=0

We multiply all the terms by the denominator


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

We add all the numbers together, and all the variables

-1u+125=0

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

-u=-125

u=-125/-1

u=+125

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