$\int_{-2}^3\left(\frac{21}{x^4}\right)dx$
$\int\frac{1+x}{1-\sqrt{x}}dx$
$\lim_{x\to-4}\left(\frac{t^2-5t+44}{x^2-t-20}\right)$
$g-1.7=-0.9$
$\left(-2p^2-10p-3\right)^2$
$x\:+\:10=-15$
$4x\:-\:5xy\:+\:8y\:-\:7x\:+\:12xy\:+\:6y\:-\:8$
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