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-31=3v+9-8v
We simplify the equation to the form, which is simple to understand
-31=3v+9-8v
We move all terms containing v to the left and all other terms to the right.
-3v+8v=+9+31
We simplify left and right side of the equation.
+5v=+40
We divide both sides of the equation by 5 to get v.
v=8
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