21. Find an L-inverse of the matrix A where $$A=begin{bmatrix}1&2&71&1&5-1&2&12&1&8end{bmatrix}$$ ...

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21. Find an L-inverse of the matrix A where

$$A=\begin{bmatrix}1&2&7\\1&1&5\\-1&2&1\\2&1&8\end{bmatrix}$$

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