$-\frac{x^7y^6}{-8x^9y^{10}}$
$-\frac{3}{x^2+x-2}$
$\left(4x^3+4xy\right)dx+\left(-1+2x^2+2y\right)dy=0$
$\frac{dy}{dx}=\frac{2y^2+9}{4x^2+25}$
$-x=25$
$3\left(u-9\right)$
$42^2-23+72$
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