-30=-12+v

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Solution for -30=-12+v equation: 



-30=-12+v

We move all terms to the left:

-30-(-12+v)=0

We add all the numbers together, and all the variables

-(v-12)-30=0

We get rid of parentheses

-v+12-30=0

We add all the numbers together, and all the variables

-1v-18=0

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

-v=18

v=18/-1

v=-18

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