Question

2( z + 1 ) - 4(z - 4) < 2(z + 5)

Answer 1

2z+2-4z+16<2z+10
-2z+18<2z+10
-2z-2z<10-18
-4z<-8
z<2

Answer 2

When you divide by a negative (-4z/-4z<-8/-4)
The sign will flip
z>2

Answer 3

thanks, i really forgot about it..@ReadingBoosters