Matrices.
Please help :)
For what value of x will the following matrix A be of rank
1) equal to 3
2) less than 3

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where is the matrix?

\[A=\left[\begin{matrix}3-x & 2 & 2 \\ 1 &4-x & 0 \\ -2 & -4 & 1-x\end{matrix}\right]\]

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