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7v-1=-9+9v
We move all terms to the left:
7v-1-(-9+9v)=0
We add all the numbers together, and all the variables
7v-(9v-9)-1=0
We get rid of parentheses
7v-9v+9-1=0
We add all the numbers together, and all the variables
-2v+8=0
We move all terms containing v to the left, all other terms to the right
-2v=-8
v=-8/-2
v=+4
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