Tìm x biết

$$\begin{gathered} \mathrm{tìm} \mathrm{x} , \mathrm{biết} \\ {3}^{2\mathrm{x}} - 1 = 27 \\ 3 . 5^{\mathrm{x}} + 36 : 32 = 79 \\ {2}^{\mathrm{x} - 2} = 64 \\ {2}^{\mathrm{x}} + 2^{\mathrm{x} + 1 }{+}^{\mathrm{x} + 2 } = 112 \\ {5}^{\mathrm{x} } + 2 . 5^{\mathrm{x} + 1 }= 275 \end{gathered}$$