| X | − | ( | 4020 | + | X | − | 10000 | ) | × | 3 100 | = | 11331 |
| Left side of the equation = | X | − | 4020 | × | 3 100 | − | X | × | 3 100 | + | 10000 | × | 3 100 |
| = | X | − | 603 5 | − | X | × | 3 100 | + | 300 |
| = | 97 100 | X | + | 897 5 |
97 100 | X | + | 897 5 | = | 11331 |
97 100 | X | = | 11331 | − | 897 5 |
97 100 | X | = | 55758 5 |
| X | = | 55758 5 | ÷ | 97 100 |
| = | 55758 5 | × | 100 97 |
| = | 55758 | × | 20 97 |
| X | = | 1115160 97 |
| X | = | 11496.494845 |