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40-v-5(12-v)-v=0
We simplify the equation to the form, which is simple to understand
40-v-5(12-v)-v=0
Reorder the terms in parentheses
40-v+(-60+5v)-v=0
Remove unnecessary parentheses
+40-v-60+5v-v=0
We move all terms containing v to the left and all other terms to the right.
-1v+5v-1v=0-40+60
We simplify left and right side of the equation.
+3v=+20
We divide both sides of the equation by 3 to get v.
v=6.66666666667
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