| x | − | ( | x | − | 5000 | ) | × | 3 100 | = | 8631 |
| Left side of the equation = | x | − | x | × | 3 100 | + | 5000 | × | 3 100 |
| = | x | − | x | × | 3 100 | + | 150 |
| = | 97 100 | x | + | 150 |
97 100 | x | + | 150 | = | 8631 |
97 100 | x | = | 8631 | − | 150 |
97 100 | x | = | 8481 |
| x | = | 8481 | ÷ | 97 100 |
| = | 8481 | × | 100 97 |
| x | = | 848100 97 |
| x | = | 8743.298969 |