| ( | 50000 | − | x | ) | ( | 8 | + | x | ÷ | 2500 | ) | = | 480000 |
| Left side of the equation = | 50000 | ( | 8 | + | x | ÷ | 2500 | ) | − | x | ( | 8 | + | x | ÷ | 2500 | ) |
| = | 50000 | × | 8 | + | 50000 | x | ÷ | 2500 | − | x | ( | 8 | + | x | ÷ | 2500 | ) |
| = | 400000 | + | 20 | x | − | x | ( | 8 | + | x | ÷ | 2500 | ) |
| = | 400000 | + | 20 | x | − | x | × | 8 | − | x | x | ÷ | 2500 |
| = | 400000 | + | 12 | x | − | x | x | × | 1 2500 |
| 400000 | + | 12 | x | − | x | x | × | 1 2500 | = | 480000 |