$-x-10x^3$
$\lim_{x\to0}\left(\frac{1}{2x\ln\left(x\right)}\right)$
$\frac{203.39285\infty}{\infty}$
$9x^2-12x+1=0$
$\lim_{x\to-1}\left(\frac{x+2}{2x^2+5x+2}\right)$
$16-y^2$
$-\frac{1}{4}\left(20z\:+\:24\right)$
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