(3/8-x)-1/5 = 1/20. объясните по действиям пж​

( 3/8 - x ) - 1/5 = 1/20

( 3 - 8x )/8 - 1/5 = 1/20

( 5 · ( 3 - 8x ) - 8 )/40 = 1/20

5 · ( 3 - 8x ) - 8 = 2

15 - 40x - 8 = 2

- 40x = 2 - 15 + 8

- 40x = - 5

x = ( - 5 )/( - 40 )

x = 1/8

1/8.