$\left(6x+9\right)\left(3x-12\right)$
$\left(5x+3\right)+3x^2-2$
$y'-y+1=0$
$\lim_{x\to-\infty}\left(\frac{x-2}{x^2-2x+1}\right)$
$25-4x^2y^2$
$y''+16y=0$
$15\:-\:\left(-14\right)\:$
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