Hello friends!

Could you please help me with the following problem?

The following matrix represents a system of linear equations:

$\displaystyle \begin{pmatrix}7&-2&0&0&0&1\\-2&5&1&0&0&12.3\\0&1&-4&2&0&-15\\0&0&2&9&-3&-6\\0&0&0&-3&6&12\end{pmatrix}$

In order to find the solutions, I use Simple-Gauss method and partial pivoting. Which will be the pivot elements? (Five decimals)

Thanks a lot.