20, 50 + х = 70, 10, 10 + х = 20, 30, х - 10 = 20, 40, х - 30 = 10, 50, 60 - х = 10, 22, 53 - х= 31, 12, 28 + х = 40, 7, х * 6 = 42, 64, х : 8 = 8, 9, 63 : х = 7.

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