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-129=-10v+1
We move all terms to the left:
-129-(-10v+1)=0
We get rid of parentheses
10v-1-129=0
We add all the numbers together, and all the variables
10v-130=0
We move all terms containing v to the left, all other terms to the right
10v=130
v=130/10
v=13
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