| 89 | = | x | ÷ | ( | x | + | ( | 1 | − | x | ) | × | 851 1000 | ) |
| 方程两边同时乘以: | ( | x | + | ( | 1 | − | x | ) | × | 851 1000 | ) |
| 89 | ( | x | + | ( | 1 | − | x | ) | × | 851 1000 | ) | = | x |
| 89 | x | + | 89 | ( | 1 | − | x | ) | × | 851 1000 | = | x |
| 89 | x | + | 75739 1000 | ( | 1 | − | x | ) | = | x |
| 89 | x | + | 75739 1000 | × | 1 | − | 75739 1000 | x | = | x |
| 89 | x | + | 75739 1000 | − | 75739 1000 | x | = | x |
13261 1000 | x | + | 75739 1000 | = | x |
13261 1000 | x | − | x | = | - | 75739 1000 |
12261 1000 | x | = | - | 75739 1000 |
| x | = | - | 75739 1000 | ÷ | 12261 1000 |
| = | - | 75739 1000 | × | 1000 12261 |
| = | - | 75739 | × | 1 12261 |
| x | = | - | 75739 12261 |
| x | = | - 6.177229 |