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70=5v+15
We move all terms to the left:
70-(5v+15)=0
We get rid of parentheses
-5v-15+70=0
We add all the numbers together, and all the variables
-5v+55=0
We move all terms containing v to the left, all other terms to the right
-5v=-55
v=-55/-5
v=+11
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