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21-8(v+3)+3+7v=6
We move all terms to the left:
21-8(v+3)+3+7v-(6)=0
We add all the numbers together, and all the variables
7v-8(v+3)+18=0
We multiply parentheses
7v-8v-24+18=0
We add all the numbers together, and all the variables
-1v-6=0
We move all terms containing v to the left, all other terms to the right
-v=6
v=6/-1
v=-6
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