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140-17v=-7v+20
We move all terms to the left:
140-17v-(-7v+20)=0
We get rid of parentheses
-17v+7v-20+140=0
We add all the numbers together, and all the variables
-10v+120=0
We move all terms containing v to the left, all other terms to the right
-10v=-120
v=-120/-10
v=+12
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