13=12-v-7

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Solution for 13=12-v-7 equation: 



13=12-v-7

We move all terms to the left:

13-(12-v-7)=0

We add all the numbers together, and all the variables

-(-1v+5)+13=0

We get rid of parentheses

1v-5+13=0

We add all the numbers together, and all the variables

v+8=0

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

v=-8

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