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-2v-12=-9v+9
We simplify the equation to the form, which is simple to understand
-2v-12=-9v+9
We move all terms containing v to the left and all other terms to the right.
-2v+9v=+9+12
We simplify left and right side of the equation.
+7v=+21
We divide both sides of the equation by 7 to get v.
v=3
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