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10v=3v+42
We move all terms to the left:
10v-(3v+42)=0
We get rid of parentheses
10v-3v-42=0
We add all the numbers together, and all the variables
7v-42=0
We move all terms containing v to the left, all other terms to the right
7v=42
v=42/7
v=6
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