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-7+18v=-17+20v
We move all terms to the left:
-7+18v-(-17+20v)=0
We add all the numbers together, and all the variables
18v-(20v-17)-7=0
We get rid of parentheses
18v-20v+17-7=0
We add all the numbers together, and all the variables
-2v+10=0
We move all terms containing v to the left, all other terms to the right
-2v=-10
v=-10/-2
v=+5
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