number the equation
Posted by
nikk
$$\begin{equation}
E = mc^2
\end{1}$$
http://answers.yahoo.com/question/index?qid=20070929120648AAiUq1U
$$\begin{align}
2x^2 + 3(x-1)(x-2) & = 2x^2 + 3(x^2-3x+2)\\
\nonumber &= 2x^2 + 3x^2 - 9x + 6\\
&= 5x^2 - 9x + 6
\end{align}$$
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