| ( | 90920 | − | 5 2 | X | ) | × | 42 5 | ÷ | 97 5 | × | 9 10 | = | 19447 | + | 7 | X |
| 方程左边 = | ( | 90920 | − | 5 2 | X | ) | × | 189 485 |
| ( | 90920 | − | 5 2 | X | ) | × | 189 485 | = | 19447 | + | 7 | X |
| 方程左边 = | 90920 | × | 189 485 | − | 5 2 | X | × | 189 485 |
| = | 3436776 97 | − | 189 194 | X |
3436776 97 | − | 189 194 | X | = | 19447 | + | 7 | X |
| - | 189 194 | X | − | 7 | X | = | 19447 | − | 3436776 97 |
| - | 1547 194 | X | = | 19447 | − | 3436776 97 |
| - | 1547 194 | X | = | - | 1550417 97 |
1550417 97 | = | 1547 194 | X |
1547 194 | X | = | 1550417 97 |
| X | = | 1550417 97 | ÷ | 1547 194 |
| = | 1550417 97 | × | 194 1547 |
| = | 91201 | × | 2 91 |
| X | = | 182402 91 |
| X | = | 2004.417582 |