$\left(4xy\right)^{-1}$
$x-8>14$
$123+89$
$\left(1-\frac{1}{x}\right)\left(1-\frac{1}{x}\right)$
$\frac{dy}{dx}-xy=\frac{x}{y}$
$3x^3-\:5x^3-6x^3$
$3^4.3^3$
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