$12-\frac{1}{3}u=2$
$12x^2-48x+36$
$4x^2+24x\:+81$
$\frac{-2x^4}{-5+x^2}$
$25x^2-200x+404$
$-8\cdot5+5$
$\lim_{x\to0}\left(\frac{\ln\left(-3x+1\right)x}{x}\right)$
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