1) m + 20 = 40 a) m = 30 b) m = 22 c) m = 20 2) n + 10 = 15 a) n = 5 b) n = 4 c) n = 6 3) m = 5 + 8 a) m = 12 b) m = 13 c) m = 14 4) x + 78 = 95 a) x = 16 b) x = 17 c) x = 18 5) 48 + x = 74 a) 26 b) 25 c) 27

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