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Content improvement

### Elementary content

This is how you add fractions and do other things too. Yay!

2+7=9

\sqrt{81}

​\sqrt81

\begin{align}​&\blue{\dfrac34}+\red{\dfrac78}\\ =&\blue{\dfrac68}+\red{\dfrac78}\\ =&\dfrac{\blue6+\red7}{\purple8}\\ =&\dfrac{13}{8}\end{align}