$\sqrt { x + 16 } - \sqrt { x } = - 2$
$\frac{\left(s^2-2st+t^2\right)}{s-t};s=6;t=7$
$\frac{dy}{dx}\left(-3x^4+6x\right)$
$x+6\le14$
$\frac{x^3+8}{x^2+4}$
$y'\:=\:4y\:+\:x^2\:+\:9$
$3.7n+1.6q$
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