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5n+8(n-5)=12
We move all terms to the left:
5n+8(n-5)-(12)=0
We multiply parentheses
5n+8n-40-12=0
We add all the numbers together, and all the variables
13n-52=0
We move all terms containing n to the left, all other terms to the right
13n=52
n=52/13
n=4
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