$\frac{x^3-6x^2+9x}{x^2-9}$
$43x^2\cdot2y$
$1+x+6-7x$
$3a^2-3$
$\int\sqrt[4]{x}\left(x+5\right)dx$
$\lim_{x\to-4}\left(5\right)$
$\left(2x-5\right)\:\left(2x-5\right)\left(2x-5\right)$
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