$\lim_{x\to-7}\left(\frac{7-\left|x\right|}{7+x}\right)$

$b^2-4b-21$

$\int\left(x-5\right)^{3}dx$

$\left(x-2\right)\cdot\left(y+8\right);\:x=2;\:y=1$

$2\:x\:\left(-5\right)\:\:x\:\:3\:x\:\left(-4\right)$

$\lim_{x\to\infty}\left(\left(\frac{\left(n+1\right)}{n-1}\right)^n\right)$

$\frac{180}{\log_{0.5}\left(0.0625\right)}$