3v+v=-12

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Solution for 3v+v=-12 equation: 



3v+v=-12

We move all terms to the left:

3v+v-(-12)=0

We add all the numbers together, and all the variables

4v+12=0

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

4v=-12

v=-12/4

v=-3

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