| 20 | ÷ | 4457 50 | + | 2 | ÷ | 45 | + | 5 | ÷ | 447 10 | + | X | ÷ | 1000 | + | ( | 121 2 | − | X | ) | ÷ | 1650 | = | 54 125 |
| 方程左边 = | 1000 4457 | + | 2 45 | + | 50 447 | + | X | × | 1 1000 | + | ( | 121 2 | − | X | ) | × | 1 1650 |
| = | 11375936 29884185 | + | 1 1000 | X | + | ( | 121 2 | − | X | ) | × | 1 1650 |
11375936 29884185 | + | 1 1000 | X | + | ( | 121 2 | − | X | ) | × | 1 1650 | = | 54 125 |
| 方程左边 = | 11375936 29884185 | + | 1 1000 | X | + | 121 2 | × | 1 1650 | − | X | × | 1 1650 |
| = | 11375936 29884185 | + | 1 1000 | X | + | 11 300 | − | X | × | 1 1650 |
| = | 249433789 597683700 | + | 13 33000 | X |
249433789 597683700 | + | 13 33000 | X | = | 54 125 |
13 33000 | X | = | 54 125 | − | 249433789 597683700 |