$-3\:x\:=\:72$
$-x^2-10x+25$
$\left(\frac{1}{6}-m^2\right)\left(\frac{1}{6}+m^2\right)$
$-3\cdot60$
$25\::\:-5\:+\:24\::\:-6\:+5\:x\:-2\:+21$
$\lim_{x\to2}\left(\frac{3x^2-2x-9}{4-x^2}\right)$
$74\sqrt{6}\times\frac{1}{2}\sqrt{2}$
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