v+13=3v-21

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Solution for v+13=3v-21 equation: 



v+13=3v-21

We move all terms to the left:

v+13-(3v-21)=0

We get rid of parentheses

v-3v+21+13=0

We add all the numbers together, and all the variables

-2v+34=0

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

-2v=-34

v=-34/-2

v=+17

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