{20x+40 <0 {2/9-4/27x>0

Question

{20x+40 <0<br> {2/9-4/27x>0

Answer 1

20х+40<0<br>x+2<0<br>x<-2<br>
2/9-4/27x>0
6/27-4/27x>0
6-4x>0
4x<6<br>x<1.5<br>