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8(2n-3)=40
We move all terms to the left:
8(2n-3)-(40)=0
We multiply parentheses
16n-24-40=0
We add all the numbers together, and all the variables
16n-64=0
We move all terms containing n to the left, all other terms to the right
16n=64
n=64/16
n=4
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