$3y-6y+9$
$\frac{2x^3+x-6}{x+2}$
$\left(4x+6y\right)\left(4x-14y\right)$
$\sqrt{1+\left(\frac{3\sqrt{x}}{4}\right)^2}$
$\left(\frac{3y}{4}\right)^2$
$\frac{3.9\:\:-4}{\left(3.9\right)^2-3\left(3.9\right)-4}$
$\frac{\left(b^6-z^6\right)}{b+z}$
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