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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