$x^2-12x+32$
$\lim_{x\to4}\left(\frac{\left(-9x^2+38x-8\right)}{x-4}\right)$
$\left(x+2y-3z\right)\left(5y-3x\right)$
$2sin^23t-sin3t-1=0$
$-12+25+47+-21$
$-7x^2y^2\left(8x^2y-5xy+11xy^2-31\right)$
$-\frac{126}{21}$
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