13=7-2v

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Solution for 13=7-2v equation: 



13=7-2v

We move all terms to the left:

13-(7-2v)=0

We add all the numbers together, and all the variables

-(-2v+7)+13=0

We get rid of parentheses

2v-7+13=0

We add all the numbers together, and all the variables

2v+6=0

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

2v=-6

v=-6/2

v=-3

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