| ( | X | ) | ÷ | ( | X | + | 9 | ) | = | 909 5000 |
| 方程两边同时乘以: | ( | X | + | 9 | ) |
| ( | X | ) | = | 909 5000 | ( | X | + | 9 | ) |
| X | = | 909 5000 | ( | X | + | 9 | ) |
| X | = | 909 5000 | X | + | 909 5000 | × | 9 |
| X | = | 909 5000 | X | + | 8181 5000 |
| X | − | 909 5000 | X | = | 8181 5000 |
4091 5000 | X | = | 8181 5000 |
| X | = | 8181 5000 | ÷ | 4091 5000 |
| = | 8181 5000 | × | 5000 4091 |
| = | 8181 | × | 1 4091 |
| X | = | 8181 4091 |
| X | = | 1.999756 |