v=2(v-21)

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Solution for v=2(v-21) equation: 



v=2(v-21)

We move all terms to the left:

v-(2(v-21))=0



We calculate terms in parentheses: -(2(v-21)), so:

2(v-21)

We multiply parentheses

2v-42

Back to the equation:

-(2v-42)



We get rid of parentheses

v-2v+42=0

We add all the numbers together, and all the variables

-1v+42=0

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

-v=-42

v=-42/-1

v=+42

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