两边通分,得:3/(x+5)(x+8)=1/(x+6)(x+7)使得分子相等:3/(x+5)(x+8)=3/3(x+6)(x+7)∴(x+5)(x+8)=3(x+6)(x+7)即x^2+13x+40=3x^2+39x+126化简,得:2x^2+26x+86=0即x^2+13x+43=0;因为△=-3<0,所以无实数解。