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28 + x = 31
x=


37 + x = 75
x=


80 + x = 83
x=


1 + x = 1
x=


17 + x = 18
x=


4 + x = 5
x=


23 + x = 47
x=


26 + x = 80
x=


46 + x = 89
x=


5 + x = 78
x=


51 - x = 42
x=


90 - x = 43
x=


32 - x = 5
x=


36 - x = 24
x=


5 - x = 3
x=


13 - x = 5
x=


40 - x = 35
x=


84 - x = 19
x=


83 - x = 71
x=


43 - x = 1
x=


x - 36 = 76
x=


x - 15 = 69
x=


x - 45 = 95
x=


x - 45 = 54
x=


x - 31 = 100
x=


x - 45 = 89
x=


x - 10 = 12
x=


x - 43 = 98
x=


x - 30 = 93
x=


x - 9 = 9
x=