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Ok,
first add diagonal element
2/3+1/6-1/3=1/2
so sum of diagonal and row is 1/2
now for row
1/2-2/3+1/6=0
in first row last column =0
in last column
1/2-0+1/3=5/6
1/2-1/6-5/6=-1/2
so
2nd row 1st column =-1/2
2nd row last column =5/6
now
1/2-2/3+1/2=1/3
3rd row 1st column =1/3
1/2+1/3-1/3=1/2
3rd row 2nd column =1/2
first add diagonal element
2/3+1/6-1/3=1/2
so sum of diagonal and row is 1/2
now for row
1/2-2/3+1/6=0
in first row last column =0
in last column
1/2-0+1/3=5/6
1/2-1/6-5/6=-1/2
so
2nd row 1st column =-1/2
2nd row last column =5/6
now
1/2-2/3+1/2=1/3
3rd row 1st column =1/3
1/2+1/3-1/3=1/2
3rd row 2nd column =1/2
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