$\frac{dy}{dx}=\frac{-\left(4x^2-y^2\right)}{\left(6y^2-2xy\right)}$
$\frac{5-z^{x}9}{521-9^{x}912}$
$4x-7y-2z=0$
$3\cos\left(2x\right)+\cos\left(x\right)+2$
$\int x^6tan\left(x^7\right)dx$
$\frac{1}{3}xy'+y=4x+1$
$-20>4-4x$
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