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13=5v+4+8
We move all terms to the left:
13-(5v+4+8)=0
We add all the numbers together, and all the variables
-(5v+12)+13=0
We get rid of parentheses
-5v-12+13=0
We add all the numbers together, and all the variables
-5v+1=0
We move all terms containing v to the left, all other terms to the right
-5v=-1
v=-1/-5
v=1/5
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