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b) 80 - 64 = 16; 22 - 6 = 16; 42 - 26 = 16; 27 - 11 = 16; 40 - 24 = 16
c) 38 + 39 = 77; 70 + 7 = 77; 61 + 16 = 77; 28 + 49 = 77; 65 + 12 = 77
d) 59 - 30 = 29; 69 - 40 = 29; 40 - 11 = 29; 51 - 22 = 29; 35 - 6 = 29