| X | ÷ | ( | X | + | 15 | ) | = | 3897 5000 |
| 方程两边同时乘以: | ( | X | + | 15 | ) |
| X | = | 3897 5000 | ( | X | + | 15 | ) |
| X | = | 3897 5000 | X | + | 3897 5000 | × | 15 |
| X | = | 3897 5000 | X | + | 11691 1000 |
| X | − | 3897 5000 | X | = | 11691 1000 |
1103 5000 | X | = | 11691 1000 |
| X | = | 11691 1000 | ÷ | 1103 5000 |
| = | 11691 1000 | × | 5000 1103 |
| = | 11691 | × | 5 1103 |
| X | = | 58455 1103 |
| X | = | 52.996374 |