$\left(a^{x-1}-1b^{x-1}\right)\left(a^{x-1}+2b^{x-1}\right)$
$\left(n-5\right)\left(n^2-4\right)$
$\frac{d}{dx}3x^2+4x+xy=4$
$\:-3+7x+x-8x$
$\frac{1}{4}x^2-7x+8+3x$
$\frac{12a^{3}-3a^{2}-5a+10}{4a+3}$
$\lim_{x\to3}\left(\log_x\left(81\right)\right)$
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