$54+-1$
$\frac{dy}{dx}=-9x^2y^2$
$\left(6x^3-5x^2+4x-7\right)\left(3x^2-4x-3\right)$
$\int\frac{8x^2-13x-1}{x^3-x}dx$
$4qr^2-\:qr^2-2qr^2$
$5x^2-9x-9$
$9x-4<0$
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