$\lim_{x\to1}\left(\frac{3x^2+5x+2}{x^2-1}\right)$
$x^2+8-20$
$\sqrt{x}x\:x^2-1$
$a^2+33-149$
$\frac{dy}{dx}-7y=-7$
$\left(5xy+4z\right)\left(7xy-3z\right)$
$x^3+8x^2+19x+12$
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