(15y-24)(3y-0,9)=0              

(15y-24)(3y-0,9)=0 ;; 45у^2-13.5у-72y+21.6=45y^2-85.5y+21.6=9y^2-17.1y+4.32=0;;;;;;;;;;  D=292.42-155.52=136.9`~12 ; x1=17.1+12/18 x2=17.1-12/18

(15y-24)(3y-0.9) = 0

15y - 24 = 0

15y = 24

y = 24/15

y = 8/5

3y - 0.9 = 0

3y = 0.9

y = 0.3

Ответ: 8/5. 0,3