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

theorem Th115: :: REAL_2'94
  c <> 0 implies a + b = (a * c + b * c) / c
proof
  assume
A1: c<>0;
  hence a+b=a*c/c+b by Lm9
    .=a*c/c+b*c/c by A1,Lm9
    .=(a*c+b*c)/c by Th62;
end;
