Пошаговое объяснение:

1)

5х/6 = 40/48

5х/6 = 5/6

5х * 6 = 6 * 5

30х = 30

х = 30 : 30

х = 1

2)

4/(3х - 11) = 2 2/63 - 1 29/63

4/(3х - 11) = 1 65/63 - 1 29/63

4/(3х - 11) = 36/63

3х - 11 = 4 : 36/63

3х - 11 = 4 * 63/36

3х - 11 = 1 * 63/9

3х - 11 = 7

3х = 7 + 11

3х = 18

х = 18 : 3

х = 6