$5a-a^2+a^3-b^2-5;\:a=2;\:b=3$
$7a^2-14a-21$
$\frac{-16^2}{n}$
$6m+6$
$6^{x+3}=-1$
$\left(-2x+-2y\right)^2$
$\frac{x}{x+4}+\frac{1}{x-4}=\frac{2}{x^2-16}$
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