| X | − | 550 | − | ( | 5 | + | 12 | + | X | × | 3 50 | ÷ | 12 | ) | = | 50 |
| Left side of the equation = | X | − | 550 | − | 5 | − | 12 | − | X | × | 3 50 | ÷ | 12 |
| = | X | − | 550 | − | 5 | − | 12 | − | X | × | 1 200 |
| = | 199 200 | X | − | 567 |
199 200 | X | − | 567 | = | 50 |
199 200 | X | = | 50 | + | 567 |
199 200 | X | = | 617 |
| X | = | 617 | ÷ | 199 200 |
| = | 617 | × | 200 199 |
| X | = | 123400 199 |
| X | = | 620.100503 |