| ( | ( | 1800 | − | 100 | x | ÷ | 3 | ) | ÷ | 10 | + | 5 | x | ÷ | 18 | ) | x | = | 600 |
| Left side of the equation = | ( | 1800 | − | 100 | x | ÷ | 3 | ) | ÷ | 10 | × | x | + | 5 | x | ÷ | 18 | × | x |
| = | ( | 1800 | − | 100 | x | ÷ | 3 | ) | × | 1 10 | x | + | 5 18 | x | x |
| = | 1800 | × | 1 10 | x | − | 100 | x | ÷ | 3 | × | 1 10 | x | + | 5 18 | x | x |
| = | 180 | x | − | 10 3 | x | x | + | 5 18 | x | x |
| 180 | x | − | 10 3 | x | x | + | 5 18 | x | x | = | 600 |