\(\Leftrightarrow\frac{x+1}{x}-\frac{x^2-5x+6}{x^2+5x+6}\le0\)
\(\Leftrightarrow\frac{\left(x+1\right)\left(x^2+5x+6\right)-x\left(x^2-5x+6\right)}{x\left(x+2\right)\left(x+3\right)}\le0\)
\(\Leftrightarrow\frac{11x^2+5x+6}{x\left(x+2\right)\left(x+3\right)}\le0\)
\(\Leftrightarrow x\left(x+2\right)\left(x+3\right)< 0\)
\(\Rightarrow\left[{}\begin{matrix}x< -3\\-2< x< 0\end{matrix}\right.\)