$\left(-x+7\right)\:-\:\left(3x+2\right)$

$1-\cos\left(x\right)-\frac{1}{2}\left(\sin\left(x\right)-\cos\left(x\right)+1\right)$

$60p-75q$

$98\cdot55$

$3a^2-7b^2x+3ax-7ab^2$

$9x^2\left(y-5\right)^2+6x\left(y-5\right)^2+4\left(y-5\right)^2$

$\lim_{x\to\pi}\left(\frac{1}{\cos^2\left(x\right)}\right)$