21=u/4+11

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Solution for 21=u/4+11 equation: 



21=u/4+11

We move all terms to the left:

21-(u/4+11)=0

We get rid of parentheses

-u/4-11+21=0

We multiply all the terms by the denominator


-u-11*4+21*4=0

We add all the numbers together, and all the variables

-1u+40=0

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

-u=-40

u=-40/-1

u=+40

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