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3(1+7v)+7(1-3v)=-v+2v
We move all terms to the left:
3(1+7v)+7(1-3v)-(-v+2v)=0
We add all the numbers together, and all the variables
3(7v+1)+7(-3v+1)-(+v)=0
We multiply parentheses
21v-21v-(+v)+3+7=0
We get rid of parentheses
21v-21v-v+3+7=0
We add all the numbers together, and all the variables
-1v+10=0
We move all terms containing v to the left, all other terms to the right
-v=-10
v=-10/-1
v=+10
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