Question

(1,8-0,3 у) (2у+9) = 0

Answer 1

1,8-0.3y=0 или 2y+9=0

1)1,8-0.3y=0
1.8=0.3y
y=1.8/0.3
y=6

2)2y+9=0
2y=-9
y=-9/2
y=-4,5

Ответ: y=6, y=-4,5.