$7x^2+x>2x-6$
$0.25\int\sqrt{4-x^2}dx$
$2x^3-3x;x=2\:;\:$
$2x^2-13x-21=0$
$x^2+9x-8$
$\frac{64n\:9\:-\:729m\:21}{4n\:3\:-\:9m\:7}$
$x^2-2x-39$
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