$\frac{1}{3x^{-1}}$
$\left(a-1\right)\left(a^2+a+1\right)$
$10-\frac{10500}{x^2}$
$2\left(-120x^2y^3\right)\left(8x^3\right)$
$\left(2x^5\:+\:7^2\right)$
$\left(11y^{n-5}-5y^n\right)^2\:$
$\frac{x^4+8x^3+12x^2-3x+20}{x+3}$
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