$\lim_{x\to0}6x^2-x+3$
$20+90+57$
$\frac{57}{3}$
$x^2-8x+45$
$\int_1^2e^{2x-3}dx$
$715m^2x+m^2x$
$\:\left(12x+20\right)-\left(\frac{4}{5}\right)$
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