tolong doong pliis buat nanti

1. Y < -12/-4
=> Y < 3

2. -3a < -12+6
=> -3a < -6
=> a < -6/-3
=> a < 2

3. 7k < 15-8k-2
=> 7k+8k < 15-2
=> 15k < 13
=> k < 13/15

4. -5y+2y > 8+7
=> -3y > 15
=> y > 15/-3
=> y > -5