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10v=7v+21
We move all terms to the left:
10v-(7v+21)=0
We get rid of parentheses
10v-7v-21=0
We add all the numbers together, and all the variables
3v-21=0
We move all terms containing v to the left, all other terms to the right
3v=21
v=21/3
v=7
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