21=v/3-12

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Solution for 21=v/3-12 equation: 



21=v/3-12

We move all terms to the left:

21-(v/3-12)=0

We get rid of parentheses

-v/3+12+21=0

We multiply all the terms by the denominator


-v+12*3+21*3=0

We add all the numbers together, and all the variables

-1v+99=0

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

-v=-99

v=-99/-1

v=+99

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