3v=40-v

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Solution for 3v=40-v equation: 



3v=40-v

We move all terms to the left:

3v-(40-v)=0

We add all the numbers together, and all the variables

3v-(-1v+40)=0

We get rid of parentheses

3v+1v-40=0

We add all the numbers together, and all the variables

4v-40=0

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

4v=40

v=40/4

v=10

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