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-12=-21-v
We move all terms to the left:
-12-(-21-v)=0
We add all the numbers together, and all the variables
-(-1v-21)-12=0
We get rid of parentheses
1v+21-12=0
We add all the numbers together, and all the variables
v+9=0
We move all terms containing v to the left, all other terms to the right
v=-9
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