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13 + x = 42
x=


8 + x = 42
x=


31 + x = 31
x=


3 + x = 21
x=


14 + x = 36
x=


23 + x = 40
x=


12 + x = 13
x=


29 + x = 37
x=


8 + x = 28
x=


8 + x = 9
x=


16 - x = 16
x=


25 - x = 22
x=


14 - x = 10
x=


4 - x = 3
x=


40 - x = 27
x=


26 - x = 17
x=


49 - x = 17
x=


41 - x = 24
x=


17 - x = 4
x=


36 - x = 2
x=


x - 15 = 30
x=


x - 26 = 31
x=


x - 7 = 20
x=


x - 29 = 30
x=


x - 24 = 31
x=


x - 38 = 41
x=


x - 12 = 38
x=


x - 0 = 39
x=


x - 42 = 49
x=


x - 24 = 31
x=