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-7v+4(v+7)=13
We move all terms to the left:
-7v+4(v+7)-(13)=0
We multiply parentheses
-7v+4v+28-13=0
We add all the numbers together, and all the variables
-3v+15=0
We move all terms containing v to the left, all other terms to the right
-3v=-15
v=-15/-3
v=+5
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