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-40v+3=-30v+21
We simplify the equation to the form, which is simple to understand
-40v+3=-30v+21
We move all terms containing v to the left and all other terms to the right.
-40v+30v=+21-3
We simplify left and right side of the equation.
-10v=+18
We divide both sides of the equation by -10 to get v.
v=-1.8
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