$6x^2-117x+660=0$
$-30+-51+17$
$\frac{\frac{1}{\sqrt{x}}-\frac{1}{2}}{x-4}$
$y'=7x+y$
$\left(-8\right)^2+6\left(-8\right)+24$
$2\cos^2x-5\cos x+2=0$
$\frac{dx}{\:dy}-y^2=9$
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