$-x^2-2x+2x^2$
$13\left(x+1\right)\left(x-1\right)$
$\lim_{x\to1}\left(\frac{\sqrt{6x+3}-3}{x-1}\right)$
$\left(-4m^2n\right)^3$
$\int y^3e^{-5y^2}dx$
$29.8-0.1$
$5x-2^2$
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