$a^2\left(3a-b\right)-b^2\left(3a+b\right)$
$x^3\left(x-a\right)\left(x+b\right)$
$\frac{x^2-5x+6}{x^2-2x}$
$\lim_{x\to-\infty}\:\left[\:2e^x\right]$
$x^3\cdot8x$
$\frac{124x^2-26}{16x+10}$
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