$2x^2+3x-x^2-x$
$\frac{81x^5}{9x^5}$
$\left|\left(-5\right)^2\right|^6$
$\frac{x^3-1}{x+1}$
$\frac{x^2}{25}-y^4$
$\left(4-6\right)\cdot5$
$\frac{x^5+3x+2x^2-7}{x^2-3x-1}$
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