$4+y=11$
$-x-20=2x+1$
$20n^{2}-9n-20$
$\:\left(5p^2+7k^9\right)^2$
$5x^3+15x^2+5$
$\frac{d}{dx}\:x^4$
$\sqrt{x-3}-\sqrt{x}=-3$
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