= 789789 - 789 + 7777 - 1000= 622521 - 789 + 5929 - 1000= 621440 - 789 - 1000= 620451 - 1000= 619451
Therefore, the answer is 619451.
= 789789 - 789 + 7777 - 1000
= 622521 - 789 + 5929 - 1000
= 621440 - 789 - 1000
= 620451 - 1000
= 619451
Therefore, the answer is 619451.