$\frac{dy}{dx}=xy+5x+4y+20$
$3cos2x-1=0$
$-4x\:+\:2y\:=10$
$\left(9^5\right)^7$
$8\left(4^2\right)+-3\left(2\right)-5+-4+\left(-3\right)$
$\sqrt[4]{\sqrt[6]{48}}^{48}$
$-2r-5=6-r-2r$
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