| ( | 40 | − | x | ) | ( | 10 | + | x | ÷ | 2 | × | 10 | ) | = | 6000 |
| Left side of the equation = | 40 | ( | 10 | + | x | ÷ | 2 | × | 10 | ) | − | x | ( | 10 | + | x | ÷ | 2 | × | 10 | ) |
| = | 40 | × | 10 | + | 40 | x | ÷ | 2 | × | 10 | − | x | ( | 10 | + | x | ÷ | 2 | × | 10 | ) |
| = | 400 | + | 200 | x | − | x | ( | 10 | + | x | ÷ | 2 | × | 10 | ) |
| = | 400 | + | 200 | x | − | x | × | 10 | − | x | x | ÷ | 2 | × | 10 |
| = | 400 | + | 200 | x | − | x | × | 10 | − | x | x | × | 5 |
| = | 400 | + | 190 | x | − | x | x | × | 5 |
| 400 | + | 190 | x | − | x | x | × | 5 | = | 6000 |