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Help please! I don't understand how to take this matrix [9 21 -18 24] [1 1 7 31] [5 1 2 20] And, First Replace

Help please! I don't understand how to take this matrix

[9 21 -18 24]

[1 1 7 31]

[5 1 2 20]

And, First Replace R with R₂- R₃

Then Replace R₁ with 2/3 R₁

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