$9y^2\:-\:36x^2y\:+\:36x^4$
$2.7\cdot3$
$\frac{d^2}{dx^2}\left(2x+7\right)^4$
$-25ab-12ab$
$6x^2-10x^2y+5x^2y$
$p^2-16$
$4a-3a$
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