21=5+4u

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Solution for 21=5+4u equation: 



21=5+4u

We move all terms to the left:

21-(5+4u)=0

We add all the numbers together, and all the variables

-(4u+5)+21=0

We get rid of parentheses

-4u-5+21=0

We add all the numbers together, and all the variables

-4u+16=0

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

-4u=-16

u=-16/-4

u=+4

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