$y+x^2=6$
$-\left(2y^4+x^4\right)dx-xy^3dy=0$
$x^2+9\ge0$
$x^5+x^8-2x$
$-2=-8+y$
$4x^2-1=0$
$\frac{2}{3}\left(\frac{x-5}{4}\right)$
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