$2u^2+u=0$
$-490+-12$
$\frac{dy}{dx}=\frac{5yx-2x^2}{2yx+5x^2}$
$25x^2+70x$
$x^2<15-2x$
$x^3\ge16$
$\ln\left(\frac{2x^2-4x+4}{3x^2+6x}\right)$
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