Question

[ 18 - 4 ( 3x-9)] ori 2 - 9 < 3 [19-5(2 x-3 )] -21 =

Answer 1

3 [19-5(2 x-3 )] -21 = 
1)2*(-3)=-6
2)5*(-6)=-30
3)19-30=-11
4)3*(-11)=-33
5)-33-21=-54

2-9=-7 
[18-4(3x-9)]=

1)3*(-9)=-27
2)4*(-27)=-108
3)18-108=-90

[18-4(3x-9)]<3[19-5(2x-3)]-21