| 5500 | = | 5000 | + | ( | x | − | 210 | ) | × | 9 | + | ( | x | − | 200 | ) | × | 5 |
| 方程右边 = | 5000 | + | x | × | 9 | − | 210 | × | 9 | + | ( | x | − | 200 | ) | × | 5 |
| = | 5000 | + | x | × | 9 | − | 1890 | + | ( | x | − | 200 | ) | × | 5 |
| = | 3110 | + | 9 | x | + | ( | x | − | 200 | ) | × | 5 |
| = | 3110 | + | 9 | x | + | x | × | 5 | − | 200 | × | 5 |
| = | 3110 | + | 9 | x | + | x | × | 5 | − | 1000 |
| = | 2110 | + | 14 | x |
| 5500 | = | 2110 | + | 14 | x |
| - | 14 | x | = | 2110 | − | 5500 |
| - | 14 | x | = | - | 3390 |
| 3390 | = | 14 | x |
| 14 | x | = | 3390 |
| x | = | 3390 | ÷ | 14 |
| = | 3390 | × | 1 14 |
| = | 1695 | × | 1 7 |
| x | = | 1695 7 |
| x | = | 242.142857 |