(2) Find the monotonic intervals and the center of symmetry of the graph of the function $y=\frac{1-3 x}{2+x}$.

Find the monotonic intervals and the center of symmetry of the graph of the function $y=\frac{1-3 x}{2+x}$.
(2) The monotonically decreasing intervals are $(-\infty,-2)$ and $(-2,+\infty)$, and the center of symmetry is the point $(-2,-3)$