Fungsi g dinyatakan dengan g(x)=

g(x) = 3x + 9 / 4

g(a) = 3(a) + 9 / 4

6 = 3a + 9 / 4

6×4 = 3a + 9

24 = 3a + 9

24 – 9 = 3a

15 = 3a

15/3 = a

5 = a