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(1-8v)4=20
We move all terms to the left:
(1-8v)4-(20)=0
We add all the numbers together, and all the variables
(-8v+1)4-20=0
We multiply parentheses
-32v+4-20=0
We add all the numbers together, and all the variables
-32v-16=0
We move all terms containing v to the left, all other terms to the right
-32v=16
v=16/-32
v=-1/2
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