$x^2+16\ge0$
$20q^4+39^2-2$
$-7x\ge-56$
$6y''+y'-y=0$
$450+90$
$\frac{dx}{dt}=80-\frac{x}{100}$
$\frac{dy}{dx}\left(x^3+y^3=2xy\right)$
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