решить уравнение
9целых3/5 : (1целая11/25х - 4целых1/5) : 2целых3/10 = 1целая1/7

9 3/5 : (1 11/25х - 4 1/5) : 2 3/10 = 1 1/7

9 3/5 : (1 11/25х - 4 1/5) = 1 1/7 * 2 3/10 = 8/7 * 23/10 = 184/70 = 92/35

1 11/25х - 4 1/5 = 9 3/5 : 92/35 = 48/5 * 35/92 = 7/2 = 3 1/2

1 11/25х = 3 1/2 + 4 1/5 = 3 5/10 + 4 2/10 = 7 7/10

х = 7 7/10 : 1 11/25 = 77/10 : 36/25 = 77/10 * 25/36 = 385/72 = 5 25/72

х = 5 25/72