$-x^2-6x-9$
$4x^2+12x-9+10x-15$
$\log\left(\frac{\sqrt[3]{2-x}}{3x}\right)$
$\left(a^2+8a+16\:\right)\left(a+4\right)$
$\left(3x\right)^2-4\left(3x\right)-12$
$\sqrt{\frac{8x+15}{3x}}$
$18^{-1}\cdot18^3$
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