(12y+30)(1,4-0,4y)=0

Question

(12y+30)(1,4-0,4y)=0

Answer 1

(12y+30)*(1,4-0.4y)= 0
12y+30=0
12y=-30 0,4y=1,4

1,4-0,4y=0
4y=1,4
y=-2,5 y=3,5
Ответ:y=-2,5;3,5

Answer 2

(12y+30)(1,4-0,7)=0
16,8y-8,4y+42-21=0
8,4y+21=0
8,4y= -21
y= -21/8,4
y= -2,5