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5(2n-4)=40
We move all terms to the left:
5(2n-4)-(40)=0
We multiply parentheses
10n-20-40=0
We add all the numbers together, and all the variables
10n-60=0
We move all terms containing n to the left, all other terms to the right
10n=60
n=60/10
n=6
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