Thank you very much for answers.
Here is another point. Even if I make add up to these 6 equations another 3 and make it 9 equations like
a+b+c = 59 ;
d+e+c = 52 ;
f+b+g = 95 ;
a+h+i = 84 ;
d+h+g = 75 ;
f+e+i = 97 ;
f+c+d = 32 ;
a+h+i = 84 ;
g+e+b = 115;
Here is the result I get:
1 1 1 0...