3v=12-v

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Solution for 3v=12-v equation: 



3v=12-v

We move all terms to the left:

3v-(12-v)=0

We add all the numbers together, and all the variables

3v-(-1v+12)=0

We get rid of parentheses

3v+1v-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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