| ( | 220 | × | 63 | − | x | ) | × | 19 20 | = | 228503 20 |
| 方程左边 = | 220 | × | 63 | × | 19 20 | − | x | × | 19 20 |
| = | 13167 | − | x | × | 19 20 |
| 13167 | − | 19 20 | x | = | 228503 20 |
| - | 19 20 | x | = | 228503 20 | − | 13167 |
| - | 19 20 | x | = | - | 34837 20 |
34837 20 | = | 19 20 | x |
19 20 | x | = | 34837 20 |
| x | = | 34837 20 | ÷ | 19 20 |
| = | 34837 20 | × | 20 19 |
| = | 34837 | × | 1 19 |
| x | = | 34837 19 |
| x | = | 1833.526316 |