$3x\:-\:8\:=\:-23$

$\left(\:x\:-\:3\:\right)\left(\:x\:-\:20\:\right)\:$

$\left(\frac{2a\:+\:\sqrt{2x}}{2a\:-\:\sqrt{2x}}\right)^2$

$\left(17+cot\left(x\right)\right)\left(17-cot\left(x\right)\right)+csc^2x$

$5^x=n$

$\lim_{x\to\infty}\left(x\cdot\sqrt{1-cos\left(\frac{\pi}{2x}\right)}\right)$

$6\left(2\right)^3\left(3\right)^2+15\left(3\right)-23\left(2\right)\left(-1\right)^2$