| X | ÷ | 1800 | = | 2 | X | + | 120 | ÷ | 3000 |
| Right side of the equation = | 2 | X | + | 1 25 |
1 1800 | X | = | 2 | X | + | 1 25 |
1 1800 | X | − | 2 | X | = | 1 25 |
| - | 3599 1800 | X | = | 1 25 |
| - | 1 25 | = | 3599 1800 | X |
3599 1800 | X | = | - | 1 25 |
| X | = | - | 1 25 | ÷ | 3599 1800 |
| = | - | 1 25 | × | 1800 3599 |
| = | - | 1 | × | 72 3599 |
| X | = | - | 72 3599 |
| X | = | - 0.020006 |