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21=6v-3
We move all terms to the left:
21-(6v-3)=0
We get rid of parentheses
-6v+3+21=0
We add all the numbers together, and all the variables
-6v+24=0
We move all terms containing v to the left, all other terms to the right
-6v=-24
v=-24/-6
v=+4
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