$\:20x-18x^2+4x^3$
$m^22mn+n^2$
$x^2+6x^2-6x$
$\left(x-3\right)\left(y^2-1\right)=6$
$2\cdot\left|3\cdot\left(-9+4\left(5\cdot3-9\right)\right)-3\cdot\left(40-8\right)\right|$
$y^2+2cx+c^2=0$
$\frac{d}{dx}x^2+y^2+2xy+y=45$
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