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2(5v+3)-4(7v+1)=-80
We move all terms to the left:
2(5v+3)-4(7v+1)-(-80)=0
We add all the numbers together, and all the variables
2(5v+3)-4(7v+1)+80=0
We multiply parentheses
10v-28v+6-4+80=0
We add all the numbers together, and all the variables
-18v+82=0
We move all terms containing v to the left, all other terms to the right
-18v=-82
v=-82/-18
v=4+5/9
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