$\frac{10^5}{10^3}$
$-5\cdot32$
$\frac{12x}{x^2-1}\cdot\frac{x+1}{3x}$
$n^2-4n-32$
$x^2\left(e^{-\frac{1}{x^2}}-1\right)$
$49x^2x+42x+9$
$4a\cdot\left(3a+8\right)$
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