$n^3\cdot2m^3n^2$
$3^3-3^2-3+1$
$18a^2b^2\:-6ac\:+2ab^3c\:+20\:$
$2xe^{-x}-x^2e^{-x}$
$3a\cdot\left(3a\right)^{8x-2}.\left(2a\right)^{3x+5}$
$17-9\cdot2-\left(-5\right)\cdot\left(-4\right)$
$\left(m^2n+\frac{1}{2}\right)\left(m^2n-\frac{1}{2}\right)$
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