6(v+7)+3v=-21

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Solution for 6(v+7)+3v=-21 equation: 



6(v+7)+3v=-21

We move all terms to the left:

6(v+7)+3v-(-21)=0

We add all the numbers together, and all the variables

3v+6(v+7)+21=0

We multiply parentheses

3v+6v+42+21=0

We add all the numbers together, and all the variables

9v+63=0

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

9v=-63

v=-63/9

v=-7

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