21=u/4

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Solution for 21=u/4 equation: 



21=u/4

We move all terms to the left:

21-(u/4)=0

We add all the numbers together, and all the variables

-(+u/4)+21=0

We get rid of parentheses

-u/4+21=0

We multiply all the terms by the denominator


-u+21*4=0

We add all the numbers together, and all the variables

-1u+84=0

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

-u=-84

u=-84/-1

u=+84

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