[tex]3 {}^{x + 2} - 5 \times 3 {}^{x } = 36 \\ 3 {}^{x} (3 {}^{2} - 5) = 36 \\ 3 {}^{x} (9 - 5) = 36 \\ 3 {}^{x} \times 4 = 36 \\ 3 {}^{x} = 9 \\ 3 {}^{x} = 3 {}^{2} \\\underline {x = 2}[/tex]
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[tex]3 {}^{x + 2} - 5 \times 3 {}^{x } = 36 \\ 3 {}^{x} (3 {}^{2} - 5) = 36 \\ 3 {}^{x} (9 - 5) = 36 \\ 3 {}^{x} \times 4 = 36 \\ 3 {}^{x} = 9 \\ 3 {}^{x} = 3 {}^{2} \\\underline {x = 2}[/tex]