$\frac{\left(x^3-5x^2+x-7\right)}{27x^3+90x^2+78x-2}$
$15m^2n+7mn$
$x+20=x^2$
$2x^5+2x^4+x+1$
$-25^1$
$\frac{2x^3+3x^2+3x+1}{x^3-1}$
$2y+4y+x$
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