Question 374759
4z-2(z+5)<=8z

4z-2z-10<=8z
..
-8z   -8z
4z-8z-2z-10<=0
..
-6z-10<=0
+10   +10
-6z-10+10<=10
-6z<=10
/-6
z>=10/-6
z>=-5/3