21=v/5-7

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Solution for 21=v/5-7 equation: 



21=v/5-7

We move all terms to the left:

21-(v/5-7)=0

We get rid of parentheses

-v/5+7+21=0

We multiply all the terms by the denominator


-v+7*5+21*5=0

We add all the numbers together, and all the variables

-1v+140=0

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

-v=-140

v=-140/-1

v=+140

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