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28=13v-6v
We move all terms to the left:
28-(13v-6v)=0
We add all the numbers together, and all the variables
-(+7v)+28=0
We get rid of parentheses
-7v+28=0
We move all terms containing v to the left, all other terms to the right
-7v=-28
v=-28/-7
v=+4
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