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15n+5(n+2)=500
We move all terms to the left:
15n+5(n+2)-(500)=0
We multiply parentheses
15n+5n+10-500=0
We add all the numbers together, and all the variables
20n-490=0
We move all terms containing n to the left, all other terms to the right
20n=490
n=490/20
n=24+1/2
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