| 10 | ( | 1 | + | x | ) | × | 600 | ( | 1 | − | 10 | x | ) | = | 10000 |
| Left side of the equation = | 6000 | ( | 1 | + | x | ) | ( | 1 | − | 10 | x | ) |
| 6000 | ( | 1 | + | x | ) | ( | 1 | − | 10 | x | ) | = | 10000 |
| Left side of the equation = | 6000 | × | 1 | ( | 1 | − | 10 | x | ) | + | 6000 | x | ( | 1 | − | 10 | x | ) |
| = | 6000 | ( | 1 | − | 10 | x | ) | + | 6000 | x | ( | 1 | − | 10 | x | ) |
| = | 6000 | × | 1 | − | 6000 | × | 10 | x | + | 6000 | x | ( | 1 | − | 10 | x | ) |
| = | 6000 | − | 60000 | x | + | 6000 | x | ( | 1 | − | 10 | x | ) |
| = | 6000 | − | 60000 | x | + | 6000 | x | × | 1 | − | 6000 | x | × | 10 | x |
| = | 6000 | − | 60000 | x | + | 6000 | x | − | 60000 | x | x |
| = | 6000 | − | 54000 | x | − | 60000 | x | x |
| 6000 | − | 54000 | x | − | 60000 | x | x | = | 10000 |