| 16000 | = | 15 | X | − | 7 | ( | X | − | 24000 | ) |
| Right side of the equation = | 15 | X | − | 7 | X | + | 7 | × | 24000 |
| = | 15 | X | − | 7 | X | + | 168000 |
| = | 8 | X | + | 168000 |
| 16000 | = | 8 | X | + | 168000 |
| - | 8 | X | = | 168000 | − | 16000 |
| - | 8 | X | = | 152000 |
| - | 152000 | = | 8 | X |
| 8 | X | = | - | 152000 |
| X | = | - | 152000 | ÷ | 8 |
| = | - | 152000 | × | 1 8 |
| = | - | 19000 | × | 1 |
| X | = | - | 19000 |