( 4x + 5 ) 2 / 3 = ( 11 + x ) 0,4

( 4x + 5 ) 2 / 3 = ( 11 + x ) 2/5

перемножаем "крест-накрест"

( 4x + 5 ) 10 = ( 11 + x ) 6

( 4x + 5 ) 5 = ( 11 + x ) 3

12х+25 = 33 + 3х

12х - 3х = 33 -25

9х = 8

х = 8/9