[tex] {3}^{x} = a[/tex]
[tex] {3}^{x + 2} = {3}^{x} .{3}^{2} [/tex] = 9a
[tex] {3}^{x + 3} = {3}^{x} . {3}^{3} [/tex] = 27a
9a + 162 = 27a
162 = 27a-9a
162 = 18a
9 = a
[tex] {3}^{x} = 9[/tex]
[tex] {3}^{x - 3} = \frac{ {3}^{x} }{ {3}^{3} } [/tex]
9/27 = 1/3
