$-23+\left(-45\right)+\left(-30\right)-25$
$12-x-x^2$
$9x^4+4x^4$
$\frac{y^2}{y-1}\frac{dy}{dx}=\frac{x^2}{x+1}$
$\frac{-5x^3+20x^2-7x+3}{x^2+2}$
$\frac{1}{5}\left(x^2-4x+3\right)<0$
$\left(3c-5f^2\right)^2$
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