| ( | 20 | − | 3223 1000 | ) | × | 60 | + | ( | 213 1000 | × | 18 | ) | = | x |
| 方程左边 = | 20 | × | 60 | − | 3223 1000 | × | 60 | + | ( | 213 1000 | × | 18 | ) |
| = | 1200 | − | 9669 50 | + | ( | 213 1000 | × | 18 | ) |
| = | 50331 50 | + | ( | 213 1000 | × | 18 | ) |
| = | 50331 50 | + | 213 1000 | × | 18 |
| = | 50331 50 | + | 1917 500 |
| = | 505227 500 |
505227 500 | = | x |
| - | x | = | - | 505227 500 |
505227 500 | = | x |
| x | = | 505227 500 |