21=v/4-15

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Solution for 21=v/4-15 equation: 



21=v/4-15

We move all terms to the left:

21-(v/4-15)=0

We get rid of parentheses

-v/4+15+21=0

We multiply all the terms by the denominator


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

We add all the numbers together, and all the variables

-1v+144=0

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

-v=-144

v=-144/-1

v=+144

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