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-7-9v=-3v-13
We move all terms to the left:
-7-9v-(-3v-13)=0
We get rid of parentheses
-9v+3v+13-7=0
We add all the numbers together, and all the variables
-6v+6=0
We move all terms containing v to the left, all other terms to the right
-6v=-6
v=-6/-6
v=1
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