| ( | x | − | 80 | ) | ÷ | 3500 | = | ( | x | − | 330 | ) | ÷ | 4500 |
| Left side of the equation = | x | × | 1 3500 | − | 80 | × | 1 3500 |
| = | x | × | 1 3500 | − | 4 175 |
1 3500 | x | − | 4 175 | = | ( | x | − | 330 | ) | ÷ | 4500 |
| Right side of the equation = | x | × | 1 4500 | − | 330 | × | 1 4500 |
| = | x | × | 1 4500 | − | 11 150 |
1 3500 | x | − | 4 175 | = | 1 4500 | x | − | 11 150 |
1 3500 | x | − | 1 4500 | x | = | - | 11 150 | + | 4 175 |
1 15750 | x | = | - | 11 150 | + | 4 175 |
1 15750 | x | = | - | 53 1050 |
| x | = | - | 53 1050 | ÷ | 1 15750 |
| = | - | 53 1050 | × | 15750 |
| = | - | 53 | × | 15 |
| x | = | - | 795 |