111,111,111 x 111,111,111 = 12,345,678,987,654,321

The equation 111111111 - x - 111111111 - 12345678987654321 simplifies to -x - 12345678987654321. The answer is true when this simplified equation equals zero. Therefore, if we solve the equation -x - 12345678987654321 = 0, we find that x must equal -12345678987654321. Hence, the statement is true when x is equal to -12345678987654321.