x = 4+y
( ) = 4+y
f(x) = 4+x
f(x) = -x - 9
(?) = -x - 9
f(g) = -x - 9
f(y) = 3(x - 5)
f(x) = 3(x - 5)
3(x - 5) = f
0
10
25
9
-9
-12
4
8
16
40
24
7
-11
1
5
-1
