| 50 | − | X | ÷ | 649 100 | = | X | ÷ | 30 | + | ( | X | − | 1 2 | ) | ÷ | 499 10 |
| Right side of the equation = | 1 30 | X | + | X | × | 10 499 | − | 1 2 | × | 10 499 |
| = | 1 30 | X | + | X | × | 10 499 | − | 5 499 |
| = | 799 14970 | X | − | 5 499 |
| 50 | − | 100 649 | X | = | 799 14970 | X | − | 5 499 |
| - | 100 649 | X | − | 799 14970 | X | = | - | 5 499 | − | 50 |
| - | 2015551 9715530 | X | = | - | 5 499 | − | 50 |
| - | 2015551 9715530 | X | = | - | 24955 499 |
24955 499 | = | 2015551 9715530 | X |
2015551 9715530 | X | = | 24955 499 |
| X | = | 24955 499 | ÷ | 2015551 9715530 |
| = | 24955 499 | × | 9715530 2015551 |
| X | = | 242451051150 1005759949 |