Реши уравнения

а) \(\left(\dfrac{1}{2}\right)^x=8\) ; \(x=\) [ ];

б) \(3^{2x+1}=27\) ; \(x=\) [ ];

в) \(\log\_3 x=2\) ; \(x=\) [ ];

г) \(\log\_\frac{1}{3} (4x+1)=-2\) ; \(x=\) [ ].