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v-2(v+10)=12
We move all terms to the left:
v-2(v+10)-(12)=0
We multiply parentheses
v-2v-20-12=0
We add all the numbers together, and all the variables
-1v-32=0
We move all terms containing v to the left, all other terms to the right
-v=32
v=32/-1
v=-32
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