$\frac{4.5^5}{4.5^3}$
$\sqrt{4x}$
$7x^2+21x-28<0\:$
$\lim_{x\to\infty}\left(\frac{6x-1}{6x+2}\right)^{x+3}$
$8x^2-6$
$\frac{dy}{dx}=\frac{x}{2y-4}$
$12-n=4n-3$
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