12v-9v=12

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Solution for 12v-9v=12 equation: 



12v-9v=12

We move all terms to the left:

12v-9v-(12)=0

We add all the numbers together, and all the variables

3v-12=0

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

3v=12

v=12/3

v=4

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