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How it became -x in R1

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in Matrices and Determinants by (15 points)
How it became -x in R1
related to an answer for: A root of the equation |(3 - x,-6,3),(-6,3 - x, 3),(3,3,-6 - x)| = 0 is … (a) 6 (b) 3 (c) 0 (d) -6
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Each item in first row has been replaced by sum of each item in each(all the three) rows using  the transformation :- R1=R1+R2+R3
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