$\left(3z-1\right)\left(3z+1\right)$
$x+2+x+27$
$y=\frac{x-5}{x^2-25}$
$3.2^2$
$14\cdot81$
$\left(m+4\right)\left(m-7\right)$
$\sqrt{x-2}\cdot\sqrt{x-2}$
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