2/3x=1 ; 5x =1/6; 4x=1/4; 7x =20​

1,5

1/30

1/16

20/7

Пошаговое объяснение:

2/3x = 1

x = 1/(2/3)

x = 3/2

5x = 1/6

x = (1/6)/5

x = 1/30

4x = 1/4

x = (1/4)/4

x = 1/16

7x = 20

x = 20/7