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- The quadratic formula is $$-b \pm \sqrt{b^2 - 4ac} \over 2a$$
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- \begin{equation}
- x=\left\{ \begin{array}{cl}
- 0 & \textrm{if }A=\ldots\\
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- x & \textrm{this runs with as much text as you like, but without an raggeright text
- .}\end{array}\right.
- \end{equation}
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