42=15v-9v

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Solution for 42=15v-9v equation: 



42=15v-9v

We move all terms to the left:

42-(15v-9v)=0

We add all the numbers together, and all the variables

-(+6v)+42=0

We get rid of parentheses

-6v+42=0

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

-6v=-42

v=-42/-6

v=+7

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