$3^3+6^2+2^2$
$\frac{x^2-18x+80}{x^2-19x+88}$
$+\left(+15\right)-\left(-13\right)-1$
$\left(ab^2+\frac{5}{2}c\right)^3$
$\frac { x - 4 } { 2 x - 4 }$
$\left(\sqrt{x^2+1}+1\right)\left(\sqrt{x^2+1}-1\right)$
$\left(g^9\right)^7$
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