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36 -x = 18

54 - x = 16

z - 39 = 26

x - 42 = 24

65 - x = 37

44 + x = 85

13 + x - 87

x + 36 = 59

x + 45 = 72

x + 13 = 87

z - 43 = 49

z - 49 = 13