| X | ÷ | 87 | − | ( | 100 | − | X | ) | ÷ | 500 | = | 131 1000 |
| Left side of the equation = | 1 87 | X | − | 100 | × | 1 500 | + | X | × | 1 500 |
| = | 1 87 | X | − | 1 5 | + | X | × | 1 500 |
| = | 587 43500 | X | − | 1 5 |
587 43500 | X | − | 1 5 | = | 131 1000 |
587 43500 | X | = | 131 1000 | + | 1 5 |
587 43500 | X | = | 331 1000 |
| X | = | 331 1000 | ÷ | 587 43500 |
| = | 331 1000 | × | 43500 587 |
| = | 331 2 | × | 87 587 |
| X | = | 28797 1174 |
| X | = | 24.528961 |