12v=7v+40

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Solution for 12v=7v+40 equation: 



12v=7v+40

We move all terms to the left:

12v-(7v+40)=0

We get rid of parentheses

12v-7v-40=0

We add all the numbers together, and all the variables

5v-40=0

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

5v=40

v=40/5

v=8

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