$xy\cdot\frac{dy}{dx}=x^2-1$
$\:\left(+68\right)\:-\:\left(\:-39\right)\:$
$x-9>-6$
$\int z\ln\left(z+1\right)dz$
$2\ln\left(x\right)=2$
$x^2-9-4$
$\frac{dy}{dx}=\frac{2x}{4y+yx^2}$
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