$2\frac{dz}{dx}=xz$
$\left(2.78\right)\cdot\left(-30.6\right)$
$-\left(3x^2-2\right)\left(3x^2+2\right)$
$20x+20<15x-30$
$\:\frac{-18}{-3}$
$-\sqrt{-96}$
$\frac{595}{3.4}$
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