| 2 | ( | x | ÷ | 1 20 | ) | = | ( | 4500 | − | x | ) | ÷ | 1 50 |
| Left side of the equation = | 2 | x | ÷ | 1 20 |
| = | 40 | x |
| 40 | x | = | ( | 4500 | − | x | ) | ÷ | 1 50 |
| Right side of the equation = | 4500 | × | 50 | − | x | × | 50 |
| = | 225000 | − | x | × | 50 |
| 40 | x | = | 225000 | − | 50 | x |
| 40 | x | + | 50 | x | = | 225000 |
| 90 | x | = | 225000 |
| x | = | 225000 | ÷ | 90 |
| = | 225000 | × | 1 90 |
| = | 2500 | × | 1 |
| x | = | 2500 |