$\frac{4mn^4}{2mn^2}$
$\left(2x^3+x^2+x-1\right)-\left(x+1\right)$
$-7^2c+15b^2c-21b^2c-3b^2c$
$\frac{6a^2b^3}{-2a}$
$\frac{dy}{dx}+4y=e^{-x}$
$\left(x+9\right)\left(x^2+2x\right)$
$5nu^8-18nu^7+9nu^6$
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