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28=-4v+8v
We move all terms to the left:
28-(-4v+8v)=0
We add all the numbers together, and all the variables
-(+4v)+28=0
We get rid of parentheses
-4v+28=0
We move all terms containing v to the left, all other terms to the right
-4v=-28
v=-28/-4
v=+7
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