Matrices and Row Operations

Transform this matrix to reduced row echelon form:

[2 - 1 - 4 | 7]

|0 - 30 20 | - 50|

[0 0 44 | - 44]

Result:

[1 0 0 |?]

|0 1 0 |?|

[0 0 1 |?]

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