$2x^2-28x+0$
$\left(8x^5+4x^3-7\right)-\left(11-x^3+5x^5\right)$
$8xy-\frac{5}{7}xy$
$\left(1+h\right)^4$
$2x^4+14x^3+8x^2$
$\frac{r}{1}\cdot\frac{x}{x+y}$
$x^2-50=0$
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