42=-7(v-3)

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Solution for 42=-7(v-3) equation: 



42=-7(v-3)

We move all terms to the left:

42-(-7(v-3))=0



We calculate terms in parentheses: -(-7(v-3)), so:

-7(v-3)

We multiply parentheses

-7v+21

Back to the equation:

-(-7v+21)



We get rid of parentheses

7v-21+42=0

We add all the numbers together, and all the variables

7v+21=0

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

7v=-21

v=-21/7

v=-3

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