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v+v+1=7*3
We move all terms to the left:
v+v+1-(7*3)=0
We add all the numbers together, and all the variables
v+v+1-21=0
We add all the numbers together, and all the variables
2v-20=0
We move all terms containing v to the left, all other terms to the right
2v=20
v=20/2
v=10
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