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10+12v=v+21
We move all terms to the left:
10+12v-(v+21)=0
We get rid of parentheses
12v-v-21+10=0
We add all the numbers together, and all the variables
11v-11=0
We move all terms containing v to the left, all other terms to the right
11v=11
v=11/11
v=1
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