$\lim_{x\to-1}\left(\frac{6x^2-6}{x^2+2x+1}\right)$
$\int\left(-12\ln\left(\sqrt{x+4}+48\right)\right)dx$
$0^4-5\cdot0^2+7\cdot0-20$
$\frac{48-40}{3x^2+2x+3}$
$\frac{8m^3}{2m}+\frac{n^3}{n}$
$10b+4+6-9b-3b-7$
$20-\left(-13\right)-\left(-7\right)$
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