| ( | 3527 | − | x | ) | ( | 2732 | − | x | ) | = | 8690000 |
| Left side of the equation = | 3527 | ( | 2732 | − | x | ) | − | x | ( | 2732 | − | x | ) |
| = | 3527 | × | 2732 | − | 3527 | x | − | x | ( | 2732 | − | x | ) |
| = | 9635764 | − | 3527 | x | − | x | ( | 2732 | − | x | ) |
| = | 9635764 | − | 3527 | x | − | x | × | 2732 | + | x | x |
| = | 9635764 | − | 6259 | x | + | x | x |
| 9635764 | − | 6259 | x | + | x | x | = | 8690000 |