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18=7v+v
We move all terms to the left:
18-(7v+v)=0
We add all the numbers together, and all the variables
-(+8v)+18=0
We get rid of parentheses
-8v+18=0
We move all terms containing v to the left, all other terms to the right
-8v=-18
v=-18/-8
v=2+1/4
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