$15\:+\:\left(-\:8\right)\:+\:\left(-\:9\right)\:+\:\left(-\:10\right)\:+\:\left(-\:12\right)\:+\:\left(-\:13\right)\:+\:\left(-\:14\right)\:$

$\int\frac{x^3}{\left(x^4+5\right)}dx$

$2^3+2^2\cdot1+2\cdot1^2-1^3$

$x^2-5x-15;\:x=-2$

$\lim_{x\to-3}\left(\frac{\sqrt{5+x}}{x-3}\right)$

$x^3-216$

$\frac{x^4-5x^3+3x^2}{x}$