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1.04n + 7.8
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n/6+10=n/2 n/6+10=3n/6 10=2n/6 60=2n 15=n
15/6n + 6/6n = 21/6n = 7/2n
n + 2n = 3n
If the number is n, then twice the number is 2n and the sum of the two is n + 2n = 3n.
2n(3n + 8)