| 10 | ( | 5 | − | 18 | x | ) | = | 18 | ( | 1 | − | 10 | x | ) |
| Left side of the equation = | 10 | × | 5 | − | 10 | × | 18 | x |
| = | 50 | − | 180 | x |
| 50 | − | 180 | x | = | 18 | ( | 1 | − | 10 | x | ) |
| Right side of the equation = | 18 | × | 1 | − | 18 | × | 10 | x |
| = | 18 | − | 180 | x |
| 50 | − | 180 | x | = | 18 | − | 180 | x |
| - | 180 | x | + | 180 | x | = | 18 | − | 50 |
| - | 0 | x | = | 18 | − | 50 |
| - | 0 | x | = | - | 32 |