Реши уравнения

а) \({\dfrac{6}{x^3-4x^2-4x+16}-\dfrac{2x-1}{x^2-4}\,\mathrlap{\,\!=}}\) \({=\dfrac{3}{x-4}}\) ;

б) \({\dfrac{2y}{y+3}-\dfrac{2y-1}{y-3}\,\mathrlap{\,\!=}}\) \({=\dfrac{3}{y^3-9y+y^2-9}}\) ;

в) \(\dfrac{x-2}{1-x+x^2}+\dfrac{3}{1+x}=\dfrac{x^2+5}{1+x^3}\) ;

г) \(\dfrac{2}{2y-1}+\dfrac{y-3}{8y^3-1}=\dfrac{1-y}{4y^2+2y+1}\) .