8v-7v-v+4v=20

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Solution for 8v-7v-v+4v=20 equation: 



8v-7v-v+4v=20

We move all terms to the left:

8v-7v-v+4v-(20)=0

We add all the numbers together, and all the variables

4v-20=0

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

4v=20

v=20/4

v=5

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