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25=2v-15
We move all terms to the left:
25-(2v-15)=0
We get rid of parentheses
-2v+15+25=0
We add all the numbers together, and all the variables
-2v+40=0
We move all terms containing v to the left, all other terms to the right
-2v=-40
v=-40/-2
v=+20
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