| 500 | x | ( | 1 | − | 5 100 | ) | − | 50 | × | 80 | − | 300 | = | 0 |
| Left side of the equation = | 500 | x | ( | 1 | − | 5 100 | ) | − | 4000 | − | 300 |
| = | 500 | x | ( | 1 | − | 5 100 | ) | − | 4300 |
| 500 | x | ( | 1 | − | 5 100 | ) | − | 4300 | = | 0 |
| Left side of the equation = | 500 | x | × | 1 | − | 500 | x | × | 5 100 | − | 4300 |
| = | 500 | x | − | 25 | x | − | 4300 |
| = | 475 | x | − | 4300 |
| 475 | x | − | 4300 | = | 0 |
| 475 | x | = | 0 | + | 4300 |
| 475 | x | = | 4300 |
| x | = | 4300 | ÷ | 475 |
| = | 4300 | × | 1 475 |
| = | 172 | × | 1 19 |
| x | = | 172 19 |
| x | = | 9.052632 |