$1x^2-0,6x-0,2$
$26\cdot6$
$3x^2-39x+126$
$\frac{dy}{dx}\left(y=x^{6x+7}\right)$
$\frac{dz}{dt}=6te^{7z}$
$\frac{-2x-4}{3}<0$
$4x^2+95x+244=7x^2+143x+436$
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