| 600 | X | − | 120000 | = | ( | 1000 | X | − | 380000 | ) | − | 80 |
| Right side of the equation = | 1000 | X | − | 380000 | − | 80 |
| = | 1000 | X | − | 380080 |
| 600 | X | − | 120000 | = | 1000 | X | − | 380080 |
| 600 | X | − | 1000 | X | = | - | 380080 | + | 120000 |
| - | 400 | X | = | - | 380080 | + | 120000 |
| - | 400 | X | = | - | 260080 |
| 260080 | = | 400 | X |
| 400 | X | = | 260080 |
| X | = | 260080 | ÷ | 400 |
| = | 260080 | × | 1 400 |
| = | 3251 | × | 1 5 |
| X | = | 3251 5 |
| X | = | 650.2 |