$\frac{2^{6n}}{6^{2n}}\left(\frac{x}{3}\right)^n$

$-3\left\{x+y\right\}-4\left[-x+2\left\{-x+2y-3\left(x-y\right)\right\}\right]$

$\frac{8\cdot1^{\frac{7}{4}}-5\cdot1^{\frac{4}{5}}-3}{1^2-1}$

$123-321x\ge\:122-320x$

$10.5=-\log_{10}\left(x\right)$

$\frac{d}{dx}\left(\frac{xy}{x^2-3}=5\right)$

$\lim_{x\to-1}\left(\frac{24x^4+6x^3+7x+11}{x+1}\right)$