$8x^2+4x+\frac{-7}{x^2}$
$m^3-2m^2+m$
$\left(a^3+\frac{b^4}{2}\right)^2$
$2xy+4y^2$
$1^1+2^2+3^3$
$-x^2+60x-779$
$-\left(3x^2-2\right)\left(3x^2+2\right)$
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