$\left(2xz\right)dx+\left(x^2-z\right)dz=0$
$\left(x^{3n}+y^{5n}\right)^2$
$x^2-14x+49-x^2-2x-1$
$y\left(\frac{dy}{dx}\right)=3\sqrt{xy^2+9x}$
$-5-1\left(-4\right)-1\left(-9\right)-1\left(+4\right)$
$x^2-y=64$
$\left(3^2\right)^{-4}\cdot3^{-2}$
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