$\int\frac{7}{x^2-6x}dx$
$\left(9-2a\right)^3$
$3k-7\left(10k-3\right)$
$-x+2y+3z-x+w-2y-2x+4z$
$12x^2-8x-15$
$\left(2-x^2\right)\left(x^2+1\right)\:\:3\:3\:\:\:\:\:\:$
$\left(x+1\left(x-3\right)\right)$
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