X . 2 = 4 - 2, X - 3 = 2 - 5, X : 5 = 5 - 25, 80 - X = 30 - 50, 15 + X = 30 - 15, X .6 = 42 - 7, X : 4 = 6 - 24, 40 + X = 70 - 30, X 2 + 2 = 18 - 4,

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