| 116658 | = | 6666 | x | + | ( | 18 | − | x | ) | × | 6000 |
| Right side of the equation = | 6666 | x | + | 18 | × | 6000 | − | x | × | 6000 |
| = | 6666 | x | + | 108000 | − | x | × | 6000 |
| = | 666 | x | + | 108000 |
| 116658 | = | 666 | x | + | 108000 |
| - | 666 | x | = | 108000 | − | 116658 |
| - | 666 | x | = | - | 8658 |
| 8658 | = | 666 | x |
| 666 | x | = | 8658 |
| x | = | 8658 | ÷ | 666 |
| = | 8658 | × | 1 666 |
| = | 13 | × | 1 |
| x | = | 13 |