$\frac{1}{2}x-\frac{4}{9}x$
$8\left(5j\right)$
$\lim_{x\to0}\left(\frac{x^2-x}{x^2-1}\right)$
$xy\left(xy^2+5y+3x^2y^2-2x^3\right)$
$-a-18=4a-33$
$45m^4n^6-5mn$
$5x^3y^4z^5-8x^2z$
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