$-4\left(3\right)\left(9\right)$
$\frac{\left(12a^4b^6c^2\right)}{8ab^3c^0}$
$\frac{2+7}{9}+\frac{2}{1+-1}$
$\frac{1}{1+\sin\left(c\right)}+\frac{1}{1-\sin\left(c\right)}=2\sec\left(c\right)$
$15x^2y^2+5x^2y-10xy^2$
$45\cdot2+45\cdot2+15\cdot2+45\cdot2+5\cdot2+11\cdot2$
$15x^2-17x-2$
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