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-10v-7=-9v
We move all terms to the left:
-10v-7-(-9v)=0
We get rid of parentheses
-10v+9v-7=0
We add all the numbers together, and all the variables
-1v-7=0
We move all terms containing v to the left, all other terms to the right
-v=7
v=7/-1
v=-7
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