$\frac{1-9z^2}{1+3z}$
$\left(\frac{3}{5}\:w-\:5p\right)^2$
$\frac{2.2}{1-4}$
$4p^2-52p+169$
$\sqrt{3\sqrt{9}}$
$6.74\cdot1.98$
$\frac{dy}{dx}=9.99^3$
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