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1 solution
For the first column, 67-59=8, 26, add the digits, 2+6=8 For the second column, 44-38=6, 24, add the digits, 2+4=6 For the third column, 21-19=2, 11, add the digits, 1+1=2 For the fourth column similarly, 7+8=15, so 2+( )=15 so ( )=>15-2=13