| ( | 90850 | − | 5 2 | X | ) | × | 42 5 | ÷ | 97 5 | × | 9 10 | = | 19447 | + | 7 | X |
| 方程左边 = | ( | 90850 | − | 5 2 | X | ) | × | 189 485 |
| ( | 90850 | − | 5 2 | X | ) | × | 189 485 | = | 19447 | + | 7 | X |
| 方程左边 = | 90850 | × | 189 485 | − | 5 2 | X | × | 189 485 |
| = | 3434130 97 | − | 189 194 | X |
3434130 97 | − | 189 194 | X | = | 19447 | + | 7 | X |
| - | 189 194 | X | − | 7 | X | = | 19447 | − | 3434130 97 |
| - | 1547 194 | X | = | 19447 | − | 3434130 97 |
| - | 1547 194 | X | = | - | 1547771 97 |
1547771 97 | = | 1547 194 | X |
1547 194 | X | = | 1547771 97 |
| X | = | 1547771 97 | ÷ | 1547 194 |
| = | 1547771 97 | × | 194 1547 |
| = | 1547771 | × | 2 1547 |
| X | = | 3095542 1547 |
| X | = | 2000.996768 |