$-15x-6$
$9z^2-1$
$\left(9a^3\:+\:6c^2\right)$
$9\cos^2x+18\cos x+9=0$
$56x-14x^2+21x^3$
$\frac{125x^{9}}{5x^{3}}$
$\left(2a^{x-1}\right)^2$
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