$\frac{x^3-3x+2}{x-1}$
$\left(x-4\right)\left(x^2-4x+16\right)$
$\frac{x}{2}+\frac{3}{4}$
$a-2\left(2a+b\right)+3\left(3a-2\right)$
$18y+15y-15y+y$
$\frac{1}{ab}-a^2b^2$
$\left(n^4-2n^2+1\right)\left(n^4+14n^2+49\right)$
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