| x | − | ( | ( | x | × | 8 100 | × | 2 | ) | + | ( | x | × | 2 100 | ) | + | ( | x | × | 1 100 | ) | ) | = | 4500 |
| 方程左边 = | x | − | ( | x | × | 8 100 | × | 2 | ) | − | ( | x | × | 2 100 | ) | − | ( | x | × | 1 100 | ) |
| = | x | − | x | × | 8 100 | × | 2 | − | ( | x | × | 2 100 | ) | − | ( | x | × | 1 100 | ) |
| = | x | − | x | × | 4 25 | − | ( | x | × | 2 100 | ) | − | ( | x | × | 1 100 | ) |
| = | 21 25 | x | − | ( | x | × | 2 100 | ) | − | ( | x | × | 1 100 | ) |
| = | 21 25 | x | − | x | × | 2 100 | − | ( | x | × | 1 100 | ) |
| = | 41 50 | x | − | ( | x | × | 1 100 | ) |
| = | 41 50 | x | − | x | × | 1 100 |
| = | 81 100 | x |
81 100 | x | = | 4500 |
| x | = | 4500 | ÷ | 81 100 |
| = | 4500 | × | 100 81 |
| = | 500 | × | 100 9 |
| x | = | 50000 9 |
| x | = | 5555.555556 |