reserve a, b, c, d, e for Complex;

theorem Th126: :: REAL_2'66_1
  b <> 0 implies a / b - e = (a - e * b) / b
proof
  assume
A1: b<>0;
  thus a/b-e=a/b+-e .=(a+(-e)*b)/b by A1,Th113
    .=(a-e*b)/b;
end;
