$\frac{5}{7}\left(\frac{1}{9}x-21\right)$

$3y-2z-3x-\left(-x-\left(y-\left(z-x\right)\right)\right)$

$x^2+36x+60$

$64^{\frac{1}{1.5}}\cdot\left(32^{\frac{2}{3}}\right)^{\frac{1}{\frac{5}{3}}}$

$\frac{-x\left(y-1\right)}{-5y\left(x-4\right)}$

$\left(\frac{1}{9}m+\frac{2}{7}n\right).\left(\frac{1}{9}m-\frac{1}{3}\right)$

$8a^2-6a^2$