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71 is 10 less than 81
81 + (56 x 6) = 81 + 336 = 417
81 84 87
x can be any number greater than 16 and less than 81.
Factors of 56: 1, 2, 4, 7, 8, 14, 28, 56Factors of 81: 1, 3, 9, 27, 81GCF (56, 81) = 1