$121a^2+66ab^2c^2+9b^4c^6$
$2x-9y-4x+6y$
$6\sqrt{7}-5\sqrt{7}+2\sqrt{7}$
$\frac{14}{3}\left(x+2\right)\left(x-2\right)$
$8x^3-36x^2+54x^2-27x^3$
$\frac{3x^4+7x^3-3x^2+10x-19}{3x-2}$
$8x^2+4x+2$
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