$$18(\frac{m_{x}}{my})\cdot x+y+(\frac{my}{mz})^{4+2}\times\frac{\mu z}{Mx})^{2+x}$$
$\frac{18Mm_{x}x^{2}z^{5}+Mmxy^{2}z^{5}+m\mu y^{7}}{Mmxyz^{5}}$
$-\frac{m\mu y^{7}}{Mmyx^{2}z^{5}}+\frac{18Mm_{x}}{Mmy}$
