$-6.5-7$
$100k^2-25$
$\left(x^2\:+\:y^2\right)^2$
$\left(\frac{2x^3}{4y^{-1}}\right)^2$
$\frac{9x^7+27x^6+5x+7}{x+3}$
$\frac{10dy}{dx}+5x=20$
$5x^2+5x^3$
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