2v=-v+21

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Solution for 2v=-v+21 equation: 



2v=-v+21

We move all terms to the left:

2v-(-v+21)=0

We add all the numbers together, and all the variables

2v-(-1v+21)=0

We get rid of parentheses

2v+1v-21=0

We add all the numbers together, and all the variables

3v-21=0

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

3v=21

v=21/3

v=7

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