$-9x^2+x+5x^4$
$\left(8a+4\right)\left(8a-10\right)$
$6x^2+16x+27>0$
$2a^2x+abx^2$
$\frac{x^4+3x^3-13x^2-27x+36}{x^2+3x-4}$
$\int_{-\infty}^{-3}\left(\frac{x-2}{x^2-4}\right)dx$
$\left(128-53\right)\left(-3-12\right)$
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