| X | − | ( | ( | X | − | 5000 | ) | × | 10 100 | − | 2520 | ) | = | 40000 |
| Left side of the equation = | X | − | ( | X | − | 5000 | ) | × | 10 100 | + | 2520 |
| = | X | − | X | × | 10 100 | + | 5000 | × | 10 100 | + | 2520 |
| = | X | − | X | × | 10 100 | + | 500 | + | 2520 |
| = | 9 10 | X | + | 3020 |
9 10 | X | + | 3020 | = | 40000 |
9 10 | X | = | 40000 | − | 3020 |
9 10 | X | = | 36980 |
| X | = | 36980 | ÷ | 9 10 |
| = | 36980 | × | 10 9 |
| X | = | 369800 9 |
| X | = | 41088.888889 |