$15m^4n-25m^3n^2-30m^2n$
$-7\left(3z+2\right)$
$\left(5xy-z\right)\left(5xy-2\right)$
$\lim_{x\to0}\left(\frac{sin\left(2t\right)}{t}\right)$
$\lim_{x\to-2}\left(\frac{x-2}{x^2-2}\right)$
$\left(5a^3b^2\right)\left(7ab^5\right)$
$\frac{3}{2+4x}$
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