$5.p=30$
$x\frac{dy}{dx}=2y\:-\:3x$
$100b^2-a^8$
$\frac{1}{cos\left(x\right)}-\frac{cos\left(x\right)}{sen\left(x\right)}$
$\frac{d^3y}{dx^3}\left(e^{2x}+e^{3x}\right)$
$\left(13-7a\right)+\left(13a+10\right)+\left(5a-2\right)+\left(-18a-6\right)$
$z^2+z-7=0$
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