$\:m^3n^4\:+n^4m^3$
$3x^3+9x^2+6x$
$\left(\frac{1}{x-3}+25x+30\right)$
$\left(\frac{5a}{4b}\right)^{-2}$
$4y''-6y'+7y=0$
$x^2+1\frac{1}{x^2}$
$x^2+121+8x$
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