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3(-7+5v)=0
We simplify the equation to the form, which is simple to understand
3(-7+5v)=0
Reorder the terms in parentheses
+(-21+15v)=0
Remove unnecessary parentheses
-21+15v=0
We move all terms containing v to the left and all other terms to the right.
+15v=0+21
We simplify left and right side of the equation.
+15v=+21
We divide both sides of the equation by 15 to get v.
v=1.4
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