21=u/4+15

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Solution for 21=u/4+15 equation: 



21=u/4+15

We move all terms to the left:

21-(u/4+15)=0

We get rid of parentheses

-u/4-15+21=0

We multiply all the terms by the denominator


-u-15*4+21*4=0

We add all the numbers together, and all the variables

-1u+24=0

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

-u=-24

u=-24/-1

u=+24

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