$670\:-\:\left(-\:340\right)$
$\left(2xy^2+\frac{4}{a}\right)dx-2\left(3-x^2y\right)dy=0$
$4x^2+17x-15$
$\frac{y^2+6y+8}{-y^2-2y}$
$\sqrt{12}+\sqrt{108}=8.3\frac{1}{2}$
$5x^2-5x-50$
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