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-3v+9=-7v-5v
We move all terms to the left:
-3v+9-(-7v-5v)=0
We add all the numbers together, and all the variables
-3v-(-12v)+9=0
We get rid of parentheses
-3v+12v+9=0
We add all the numbers together, and all the variables
9v+9=0
We move all terms containing v to the left, all other terms to the right
9v=-9
v=-9/9
v=-1
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