$2an^3-8an$
$\frac{dy}{dx}=\frac{2xy-x^2+y^2}{2xy+x^2-y^2}$
$4x\:+\:20x^2$
$5a-12b+2a+b-7b-8b+b+c$
$\sqrt{x}-5=2$
$\frac{3x^{7}y}{27x^{7}y^{7}}$
$004x^2+012xy+009y^2$
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