$\frac{dy}{dx}=\frac{e^y}{2y-e^y}$
$-\:2\left(x-3\right)^2+4$
$9\left(x+2\right)^2-169\left(x-y\right)^2\:$
$t\left(t+6\right)=0$
$\left(4y+11\right)\left(4y-6\right)$
$100b^4-49^6$
$x^2-6+9$
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