9 20 | X | + | ( | 2580 | X | ÷ | 1800 | ) | = | X | × | 13 20 | × | 3 25 |
| Left side of the equation = | 9 20 | X | + | 2580 | X | ÷ | 1800 |
| = | 9 20 | X | + | 43 30 | X |
| = | 113 60 | X |
113 60 | X | = | X | × | 13 20 | × | 3 25 |
| Right side of the equation = | X | × | 39 500 |
113 60 | X | = | 39 500 | X |
113 60 | X | − | 39 500 | X | = | 0 |
677 375 | X | = | 0 |
| X | = | 0 | ÷ | 677 375 |
| = | 0 | × | 375 677 |
| X | = | 0 |