2a-4 when a=3
2
4(2x-3)
8x-12
6y/8 when y=4
3
(3-x) 4
12-4x
23-2z when z =11
1
6(2y-4)
12y-24
3y / 2 when y =-2
-3
-3(2-2x)
-6+6x
(2m+5)/3 when m =2
-2(-1-z)
2 +2z