(15x19-x-0.15):0.25=15:0.25=60
(15x19-x-0.15) =60x0.25=15
285-x-0.15=15
285-0.15-x=15
284,85-x=15
x=284,85-15
x=269,85
( 15 . 19 - x - 0,15 ) : 0,25 = 15 : 0,25
( 285 - x - 0,15 ) : 0,25 = 60
284,85 - x = 60 . 0,25
284,85 - x = 15
x = 284,85 - 15
x = 269,85
( 15 x 19 - x - 0.15 ) : 0.25 = 15 : 0.25
( 285 - 0.15 - x ) : 0.25 = 60
284.85 - x = 60 x 0.25
284.85 - x = 15
x = 284.85 - 15
x = 269.85