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3v-=7+2v-v
We simplify the equation to the form, which is simple to understand
3v-=7+2v-v
We move all terms containing v to the left and all other terms to the right.
+3v-2v+1v=-7
We simplify left and right side of the equation.
+2v=-7
We divide both sides of the equation by 2 to get v.
v=-3.5
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