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-7v+2(v+5)=20
We move all terms to the left:
-7v+2(v+5)-(20)=0
We multiply parentheses
-7v+2v+10-20=0
We add all the numbers together, and all the variables
-5v-10=0
We move all terms containing v to the left, all other terms to the right
-5v=10
v=10/-5
v=-2
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