13. Select equivalent expressions AND solve. -\frac{3}{x^{2}+3}+\frac{1}{x+1}-\frac{2}{\left(x^{2}+3\right)(x+1)} \geq \frac{3}{x^{2}+3} \text { A }[[x>(-1), x \leq-\sqrt{14}+3],[x \geq \sqrt{14}+3]] \text { B }\left[[x<(-3)],\left[x>1, x \leq\left(\frac{3}{2}\right)\right]\right]