$\frac{30z^3-18z^2}{6z^3+5z^2}\cdot\frac{42z+35}{60z-36}$

$-\frac{4}{5}n-\frac{2}{7}n+\frac{1}{7}$

$x^2-5x-33$

$2\sqrt{2}\sin\left(10\right)\cos\left(25\right)-2\sin\left(20\right)\sin\left(10\right)=x-\cos\left(80\right)$

$\frac{x-3}{4}+\frac{x-2}{3}\le\frac{11}{12}$

$\int\frac{8x^2}{\left(x^3+2\right)^2}dx$

$5c-2h+4hc+2hc+6h-7c+hc$