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notam numerele cu a,b, si c b:a=3 rest 3
b= a×3+3
c:b= 2 rest 7
c=2xb+7
c-a=738
2b+7-a=738
6a+6+7-a=738
5a+13=738
5a=738-13
5a=725
a=725:5
a=145
d= 145x3+3
b=438
c=738+145
c=883