| 18 | x | − | 12 | x | × | 18 | = | 8 | x | − | 7 | x | × | 8 |
| Left side of the equation = | 18 | x | − | 216 | x |
| = | - | 198 | x |
| - | 198 | x | = | 8 | x | − | 7 | x | × | 8 |
| Right side of the equation = | 8 | x | − | 56 | x |
| = | - | 48 | x |
| - | 198 | x | = | - | 48 | x |
| - | 198 | x | + | 48 | x | = | 0 |
| - | 150 | x | = | 0 |
| - | 0 | = | 150 | x |
| 150 | x | = | - | 0 |
| x | = | - | 0 | ÷ | 150 |
| = | - | 0 | × | 1 150 |
| x | = | 0 |