$\frac{x}{\sqrt{y}}$
$5r\le-80$
$12xyz+8x^2y^3z^4+10x^4y^2z^3$
$3-2x\ge5$
$64x^3y^2+16xy^3$
$\frac{13}{2x}-\frac{5}{x}$
$x^2-30x$
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