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20 + x = 18
x=


19 + x = 14
x=


10 + x = 2
x=


17 + x = 10
x=


5 + x = 2
x=


1 + x = 20
x=


8 + x = 9
x=


19 + x = 10
x=


7 + x = 14
x=


17 + x = 20
x=


1 - x = 4
x=


11 - x = 14
x=


9 - x = 3
x=


10 - x = 17
x=


15 - x = 13
x=


16 - x = 12
x=


12 - x = 10
x=


11 - x = 13
x=


19 - x = 1
x=


10 - x = 20
x=


x - 9 = 4
x=


x - 13 = 0
x=


x - 10 = 18
x=


x - 11 = 12
x=


x - 11 = 17
x=


x - 17 = 7
x=


x - 18 = 15
x=


x - 3 = 10
x=


x - 20 = 20
x=


x - 14 = 0
x=