$\frac{2mn^3}{7}+7mn-5mn^3+9+\frac{4mn^3}{3}-mn-13-m$
$3x^2+27x$
$\lim_{x\to5}\left(\frac{x^4-625}{x+5}\right)$
$\left(5u-3v+3n^2\right)^2$
$\left(x-2a\right)\left(x+2b\right)$
$1203^2$
$86.978'92+6.879+95$
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