$\left[-20\right]\cdot0$
$\left(n+11\right)\left(n-11\right)$
$\frac{x}{9}-\frac{y}{9}$
$\int\frac{x-7}{x^2-x-13}dx$
$-4-6+1+3-3+1-2-2+1-7$
$x+tan\left(xy\right)=0$
$a^2+ab^2$
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