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-20+7(3v-20)=13v
We move all terms to the left:
-20+7(3v-20)-(13v)=0
We add all the numbers together, and all the variables
-13v+7(3v-20)-20=0
We multiply parentheses
-13v+21v-140-20=0
We add all the numbers together, and all the variables
8v-160=0
We move all terms containing v to the left, all other terms to the right
8v=160
v=160/8
v=20
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