$12.3ab+6ac-9ad$
$9^3\cdot3^2$
$\frac{dy}{dx}+y=10\cos\left(3x\right)$
$\frac{b^2-a^2}{4a^2+2ab-2b^2}$
$\left(3n+2b\right)\left(3n-2b\right)$
$b^2-26b-19=0$
$-1\le\frac{x-2}{21}$
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