$4x^2+14x+12$
$15xy\:y\:+\:19xy$
$\left(12\cdot10\right)-\left(12\cdot9\right)$
$8a^2-14a-120$
$\lim_{x\to0}\left(\frac{x^2+4x}{3x^3+x^2-x}\right)$
$\frac{d}{dx}x^7-y^7=97$
$4^3\:\cdot16$
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