$x^3-3x-13x+15$
$7\cdot\left(-8\right)\cdot12$
$\left(x+3\right)^3\left(2x+3\right)^3$
$x+3y=2$
$9m^2-36mn+36n^2$
$\lim_{x\to0}\left(\frac{e^x-x-1}{1-cosx}\right)$
$-005x^2+5x-1$
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