$\left(a^2-a^2b\right)-\left(7a^2b+9ab^2\right)$
$\left(7x+32\right)\left(7x-32\right)$
$6c-8-2c=16$
$2x+4y+z=13$
$\lim_{x\to5}\left(\frac{\sqrt{25-x^2}}{x}\right)$
$81c^2-144m^2$
$6am+9bm+4an+6bn$
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