$3\frac{dy}{dx}+y=3e^xy^4$
$77+88$
$y\:dx\:-\:x^2\:dy\:=0$
$\frac{1}{y^2}-\frac{2}{y^4}=y^{-2}-2y^{-4}$
$9+8\cdot\left(3-5\right)+9$
$f^4-3f^2-4$
$\left(3w\:+\:5z\right)\:\left(3w\:-\:5z\right)$
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