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Without expanding a determinant at any stage, show that `abs((x^2+x ,x+1 , x-2),(2x^2+3x-1 ,3x , 3x-3) , (x^2+2x+3, 2x-1 ,2x-1))=xA+B` ,where `A` and `B` are determinant of order 3 not involving `xdot`

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