86 = 1p + 5n
n = p + 4
86 = 1p + 5(p + 4)
86 = 1p + 5p + 20
66 = 6p; p = 11
86 = 1(11) + 5n
86 = 11 + 5n
75 = 5n; 15 = n
11 pennies, 15 nickels
11(1) + 15(15) = 11 + 75 = 86
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