| ( | x | − | 40 | ) | ( | 150 | − | 5 | ( | x | − | 60 | ÷ | 10 | ) | ) | = | 5600 |
| Left side of the equation = | x | ( | 150 | − | 5 | ( | x | − | 60 | ÷ | 10 | ) | ) | − | 40 | ( | 150 | − | 5 | ( | x | − | 60 | ÷ | 10 | ) | ) |
| = | x | × | 150 | − | x | × | 5 | ( | x | − | 60 | ÷ | 10 | ) | − | 40 | ( | 150 | − | 5 | ( | x | − | 60 | ÷ | 10 | ) | ) |
| = | 150 | x | − | x | × | 5 | x | + | x | × | 5 | × | 60 | ÷ | 10 | − | 40 | ( | 150 | − | 5 | ( | x | − | 60 | ÷ | 10 | ) | ) |
| = | 150 | x | − | x | × | 5 | x | + | x | × | 30 | − | 40 | ( | 150 | − | 5 | ( | x | − | 60 | ÷ | 10 | ) | ) |
| = | 180 | x | − | x | × | 5 | x | − | 40 | ( | 150 | − | 5 | ( | x | − | 60 | ÷ | 10 | ) | ) |
| = | 180 | x | − | x | × | 5 | x | − | 40 | × | 150 | + | 40 | × | 5 | ( | x | − | 60 | ÷ | 10 | ) |
| = | 180 | x | − | x | × | 5 | x | − | 6000 | + | 200 | ( | x | − | 60 | ÷ | 10 | ) |
| = | 180 | x | − | x | × | 5 | x | − | 6000 | + | 200 | x | − | 200 | × | 60 | ÷ | 10 |
| = | 180 | x | − | x | × | 5 | x | − | 6000 | + | 200 | x | − | 1200 |
| = | 380 | x | − | x | × | 5 | x | − | 7200 |
| 380 | x | − | x | × | 5 | x | − | 7200 | = | 5600 |