$2\left[4+3\left(5-9\right)\right]$
$\:\left(y+x^2\right)^3$
$y^5-y$
$\frac{3+x}{2}+\frac{x-1}{3}-\frac{2x-3}{6}$
$-1+5+1$
$\left(12.5\right)-\left(-25\right)$
$81m^6n^4+126m^3n^2x^4+49x^8$
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