$\left(x^2+3x+1\right)\left(5x^2-7x-4\right)$
$\left(-21\cdot\:1668\right)$
$\frac{dy}{dx}-x\sqrt{x^2-16}=0$
$2x+4y=50$
$64b^2-121$
$x^3y'+4y^2=0$
$4x+3y-y+9+2x-4$
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