$11r\:+\:15\:=\:-2r^2$
$x^2-2x-8\le0$
$x^2-9=112$
$3x-4y=6$
$49x^2-14x-1$
$\frac{3}{5x}=\frac{2}{x-7}$
$\frac{3x+3}{x^2-8x-9}$
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