$\frac{dy}{dx}\left(\frac{1-2x}{3x^2}\right)x=1$
$\frac{d}{dx}\frac{2x^2+4x-3}{x-5}$
$28.527+90.54$
$3x^2-2x+1\:.\:x-2$
$b^2+b^2+b^2+b$
$18\times4+\left(-5\right)$
$4x\left(2+3x\right)-4+3x$
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