[tex] 3\log_7y + 4(\log_7x - 5\log_7z)\log_7y^{3} + 4(\log_7x - 5\log_7z)\log_7y^{3} + 4(\log_7x - \log_7z^{5})\log_7y^{3} + 4(\log_7(\frac{x}{z^{5}}))\log_7y^{3} + \log_7(\frac{x}{z^{5}})^{4}\log_7(y^{3} \times (\frac{x}{z^5{5}})^{4}) [/tex]
