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20=3v-10
We move all terms to the left:
20-(3v-10)=0
We get rid of parentheses
-3v+10+20=0
We add all the numbers together, and all the variables
-3v+30=0
We move all terms containing v to the left, all other terms to the right
-3v=-30
v=-30/-3
v=+10
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