$7y+2x+\left(7x+2y\right)y'\:=0$
$8x^2-7x=0$
$x^3x^{-7}$
$-x^2+12x^3-4x;\:x=-2$
$ln\sqrt{1-x^4}$
$\left(x^2+x\:0.3\right)\left(x^2-0.5\right)$
$8x\left(x-3\right)$
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