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55=5v+15
We move all terms to the left:
55-(5v+15)=0
We get rid of parentheses
-5v-15+55=0
We add all the numbers together, and all the variables
-5v+40=0
We move all terms containing v to the left, all other terms to the right
-5v=-40
v=-40/-5
v=+8
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