Tìm x

Bài 2:Tìm x
$$\begin{gathered} \mathrm{a}) \frac{-7}{1+2\mathrm{x}}=\frac{5}{2-3\mathrm{x}} \\ \mathrm{b})8.3^{\mathrm{x}}-3^{\mathrm{x}+1}=2^3.3^2+567.3^{-2} \end{gathered}$$
aiii nhanhh mk chấm cho 5đ