$\left(28x^2+54x+28\right)x\left(2x-1\right)$
$\frac{16x^5-8x^3+20x}{4x}$
$\lim_{x\to0}\left(\frac{e^{\frac{1}{x}}}{x^{-3}}\right)$
$\frac{n}{b^n}\left(x-a\right)^n$
$\left(-10a+2\right)^2$
$x34x^25x$
$\frac{5^{18}}{5^2}$
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