8n = 72
n = 72 / 8
n = 9
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Yes. By definition a multiple of 8 is any number that can be expressed as 8*n, where n is an integer. But 8n=4*(2*n), and 2*n is an integer, when n is an integer. Because 8n equals four times an integer, 8n is a multiple of 4.
5
2n-5 = 8n+7 Subtract 8n from both sides and add 5 to both sides:- -6n = 12 Divide both sides by -6 to find the value of n:- n = -2
N=72
8n + (5-n) + 13 = 7n + 18