abcdef :bcdef= a+1 rest a+6
abcdef =bcdef •(a+1) + a+6
a•100000+bcdef =bcdef •a+ bcdef + a+6
a•100000 +bcdef - bcdef •a –a - bcdef = 6
a(100000 - bcdef -1)=6
a(99 999-bcdef)=6
99 999-bcdef ∈ {1, 2, 3, 6}
Pentru 99 999-bcdef=1 => a=6; bcdef=99 998; abcdef=699 998
Pentru 99 999-bcdef=2 => a=3; bcdef=99 997; abcdef=399 997
Pentru 99 999-bcdef=3 => a=2; bcdef=99 996; abcdef=299 996
Pentru 99 999-bcdef=6 => a=1; bcdef=99 993; abcdef=199 993
