$5\left(m-n\right)$
$\left(x+9\right)x\left(x-9\right)$
$x^5-2x^4-3x^3+6x^2+2x-4$
$24x^2-64$
$\frac{3x^2}{4y}=x$
$\left(2+1\right)^n$
$\int\sec\left(\frac{x}{2}\right)dx$
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