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-8v+4(v-4)=20
We move all terms to the left:
-8v+4(v-4)-(20)=0
We multiply parentheses
-8v+4v-16-20=0
We add all the numbers together, and all the variables
-4v-36=0
We move all terms containing v to the left, all other terms to the right
-4v=36
v=36/-4
v=-9
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