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v-(v-20)=0
We simplify the equation to the form, which is simple to understand
v-(v-20)=0
Remove unnecessary parentheses
v-1v+20=0
We move all terms containing v to the left and all other terms to the right.
+1v-1v=0-20
We simplify left and right side of the equation.
v=-20
0=-20
The left and right sides are not equal, therefore there is no solution. This equation is invalid.
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