| 18 | ÷ | 102 | + | 7 | ÷ | 447 10 | + | 5 | ÷ | 249 5 | + | X | ÷ | 255 2 | + | ( | 267 5 | − | X | ) | ÷ | 1000 | = | 37 50 |
| 方程左边 = | 3 17 | + | 70 447 | + | 25 249 | + | X | × | 2 255 | + | ( | 267 5 | − | X | ) | × | 1 1000 |
| = | 273398 630717 | + | 2 255 | X | + | ( | 267 5 | − | X | ) | × | 1 1000 |
273398 630717 | + | 2 255 | X | + | ( | 267 5 | − | X | ) | × | 1 1000 | = | 37 50 |
| 方程左边 = | 273398 630717 | + | 2 255 | X | + | 267 5 | × | 1 1000 | − | X | × | 1 1000 |
| = | 273398 630717 | + | 2 255 | X | + | 267 5000 | − | X | × | 1 1000 |
| = | 1535391439 3153585000 | + | 349 51000 | X |
1535391439 3153585000 | + | 349 51000 | X | = | 37 50 |
349 51000 | X | = | 37 50 | − | 1535391439 3153585000 |