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-10v+9=-3-7v
We move all terms to the left:
-10v+9-(-3-7v)=0
We add all the numbers together, and all the variables
-10v-(-7v-3)+9=0
We get rid of parentheses
-10v+7v+3+9=0
We add all the numbers together, and all the variables
-3v+12=0
We move all terms containing v to the left, all other terms to the right
-3v=-12
v=-12/-3
v=+4
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