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1 целая 3/7*c+7/8=1 целая 3/8

10/7 c + 7/8 = 11/810/7 c = 11/8 - 7/810/7 c = 4/810/7 c = 1/2c = 1/2 ÷ 10/7c = 1/2 × 7/10c = 7/20c = 0,35

1 3/7 * с + 7/8 = 1 3/8

1 3/7с = 1 3/8 - 7/8 (1 3/8 - 7/8 = 11/8 - 7/8 = 4/8 = 1/2)

1 3/7с = 1/2

с = 1/2 : 1 3/7 (1/2 : 1 3/7 = 1/2 : 10/7 = 1/2 * 7/10 = 7/20)

с = 7/20