9c7×125x3{ }^{9} c_{7} \times \frac{125}{x^{3}}9c7×x3125
−9c7×125x3-{ }^{9} c_{7} \times \frac{125}{x^{3}}−9c7×x3125
−7c6×125x3-{ }^{7} c_{6} \times \frac{125}{x^{3}}−7c6×x3125
99c6×125x3{ }_{9}^{9} c_{6} \times \frac{125}{x^{3}}99c6×x3125