| 60 | ( | 1 | − | X | ) | × | 2 | = | 0 |
| Left side of the equation = | 120 | ( | 1 | − | X | ) |
| 120 | ( | 1 | − | X | ) | = | 0 |
| Left side of the equation = | 120 | × | 1 | − | 120 | X |
| = | 120 | − | 120 | X |
| 120 | − | 120 | X | = | 0 |
| - | 120 | X | = | 0 | − | 120 |
| - | 120 | X | = | - | 120 |
| 120 | = | 120 | X |
| 120 | X | = | 120 |
| X | = | 120 | ÷ | 120 |
| = | 120 | × | 1 120 |
| = | 1 | × | 1 |
| X | = | 1 |