#1a
28x - 12
2x + 17
2x + 18
2x - 18
#1b
-2x + 10
6x - 10
2x + 10
-6x + 10
#2a
8x + 8
16x + 10
16x + 16
#2b
40x + 15
8x + 15
#3
-19.6
20.4
8
50
#4
3.3
7.5
-3.3
-7.5
#5
0.06
3
-3
-3.6
#6
9
1.8
65
23.4