| ( | 330821 5000 | − | x | ) | ÷ | 20039 10000 | = | 17 5 |
| 方程左边 = | 330821 5000 | × | 10000 20039 | − | x | × | 10000 20039 |
| = | 661642 20039 | − | x | × | 10000 20039 |
661642 20039 | − | 10000 20039 | x | = | 17 5 |
| - | 10000 20039 | x | = | 17 5 | − | 661642 20039 |
| - | 10000 20039 | x | = | - | 2967547 100195 |
2967547 100195 | = | 10000 20039 | x |
10000 20039 | x | = | 2967547 100195 |
| x | = | 2967547 100195 | ÷ | 10000 20039 |
| = | 2967547 100195 | × | 20039 10000 |
| = | 2967547 3455 | × | 691 10000 |
| x | = | 2050574977 34550000 |
| x | = | 2967547 50000 |
| x | = | 59.35094 |