The center of mass can be found using the formula:
$$x_{cm} = \frac{m_1x_1 + m_2x_2}{m_1 + m_2}$$
where $m_1$ and $m_2$ are the masses of the man and the board, and $x_1$ and $x_2$ are their respective positions.
Let's assume the man is standing at the left end
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