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v+4=-12+3v
We simplify the equation to the form, which is simple to understand
v+4=-12+3v
We move all terms containing v to the left and all other terms to the right.
+1v-3v=-12-4
We simplify left and right side of the equation.
-2v=-16
We divide both sides of the equation by -2 to get v.
v=8
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