| ( | 89674119 100 | − | X | ) | ÷ | X | = | 499 5000 |
| 方程两边同时乘以: | X |
| ( | 89674119 100 | − | X | ) | = | 499 5000 | X |
89674119 100 | − | X | = | 499 5000 | X |
| - | X | − | 499 5000 | X | = | - | 89674119 100 |
| - | 5499 5000 | X | = | - | 89674119 100 |
89674119 100 | = | 5499 5000 | X |
5499 5000 | X | = | 89674119 100 |
| X | = | 89674119 100 | ÷ | 5499 5000 |
| = | 89674119 100 | × | 5000 5499 |
| = | 9963791 | × | 50 611 |
| X | = | 498189550 611 |
| X | = | 815367.512275 |