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48=3v+5v
We move all terms to the left:
48-(3v+5v)=0
We add all the numbers together, and all the variables
-(+8v)+48=0
We get rid of parentheses
-8v+48=0
We move all terms containing v to the left, all other terms to the right
-8v=-48
v=-48/-8
v=+6
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