$3\left(x\:-\:4\right)\:=\:6x\:+\:12$

$\frac{5x^2-3x}{x}$

$\left(x^{2m-5}-9\right)\left(x^{2m-5}+8\right)$

$\lim_{x\to\pi}\left(\frac{1+\cos\left(x\right)}{1-\cos\:\left(x\right)}\right)$

$5-2t\ge\frac{2-4t}{2}$

$2x-3\le4x+7$

$\left(9x^{\frac{3}{4}}y^{\frac{7}{3}}\right)\left(-7x^{\frac{5}{4}}y^{\frac{7}{2}}\right)$