$\lim_{x\to5}\frac{x^5-2x-15}{x-5}$

$\int\frac{3x^3+x}{\left(x^2+1\right)^2}dx$

$\frac{9y^3-16y+8}{3y^2+3y-4}$

$\lim_{x\to0}\left(\frac{6x}{\arctanh\left(2x\right)}\right)$

$\frac{2}{10}a+\frac{3}{10}b-\frac{1}{5}a+\frac{3}{5}b$

$\left(s^2-6s+9\right)$

$-\:-\:\left(-\:8\::\:2\:+\:5\right)\:-\:\left(-\:4\:-\:9:3\right)\:-\:\left(\:2\left(-\:5\right)\:+\:7\:\right)\:-\:\left(\:-12:\:4\:\right)\:-\:\left(-18\::\:9\right)$