Correct: 7 + 14 = 21, а + 6, 45 : у, 34 + 13 = 47, 28 : с, 67 - 13 = 54, х + у, 3 х с, 18 : 9 = 2, 20 + х, Incorrect: х - 45 = 30, с + 24 = 47, у • 17 = 34, 5 • с = 40, х + 56 = 83, 37 - у = 15, 48 : с = 8, 6 • а = 54, 90 - у = 27, х • 35 = 70,

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