[tex]\frac{ {q}^{10} }{cb} \times \frac{ {q}^{2} }{cbd} = \\ \frac{ {q}^{10} }{c} \times \frac{cbd}{ {q}^{2} } = \frac{ {q}^{8} }{1} \times \frac{d}{1} = \\ = \frac{ {q}^{8} \times d }{1} = \\ = {q}^{8} d[/tex][/tex]