$6x^2+13x+6=0$
$4x^2-5x+9\:;\:x=-2$
$\sqrt{2x}\cdot\sqrt{121x}$
$5x\le10$
$\frac{d}{dx}\sqrt{x+\sqrt{x+\sqrt{x}}}$
$2x+3y=11$
$\frac{a^2-11a+30}{a-5}$
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