$25xy^2+80xy+81y^2$
$25a^{10}-c^8$
$y^{'\:}-3y=6$
$4z^2-16z=36$
$\lim_{x\to\frac{x}{6}}\frac{\tan x}{\sin^2x}$
$5+4x>3x+2$
$20x^2-7x+40$
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