设P点坐标为(a,b),则b=-3a/2+3,
点P到两个坐标轴的距离相等,
=> |a|=|b|,
=> ±a=-3a/2+3,
=> a=b=6/5
或a=6,b=-6
则P点坐标为(6/5,6/5)或(6,-6)