$\frac{3}{8}x\frac{3}{1}$
$-2x+3\le9$
$8r+10-11s-7-18s$
$\frac{10x^3+23x^2+5x+6}{5x-1}$
$4x-5y+3x+2x+6y$
$\frac{3x-1}{2}<7$
$2x+3.\frac{x+2}{x-2}$
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