$10xyz+20x^2y^2z^2$
$-a^2b^2-c^2$
$\int_0^1\left(4-2x\right)dx$
$\frac{dy}{dx}=2x^2+2y+1$
$x^2+4x=20y-24$
$\lim_{x\to-3}\left(4x^2+12x\right)$
$\lim_{x\to-9}\left(\frac{x^2+13x+36}{x+9}\right)$
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