$3a+9a-11a-14a+2b-5b$
$a^2-ab+b^2^2$
$\frac{x^2-\frac{1}{2}x-6}{x+2}$
$\left(6k-3\right)\left(k+3\right)$
$3n+n^2-10$
$8x^{3\:}\sqrt{3x}+2\sqrt{108x^7}$
$\frac{60}{3}+15-8$
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