| 1000 | ÷ | ( | 1 | + | x | ) | = | 9871 10 |
| 方程两边同时乘以: | ( | 1 | + | x | ) |
| 1000 | = | 9871 10 | ( | 1 | + | x | ) |
| 1000 | = | 9871 10 | × | 1 | + | 9871 10 | x |
| 1000 | = | 9871 10 | + | 9871 10 | x |
| - | 9871 10 | x | = | 9871 10 | − | 1000 |
| - | 9871 10 | x | = | - | 129 10 |
129 10 | = | 9871 10 | x |
9871 10 | x | = | 129 10 |
| x | = | 129 10 | ÷ | 9871 10 |
| = | 129 10 | × | 10 9871 |
| = | 129 | × | 1 9871 |
| x | = | 129 9871 |
| x | = | 0.013069 |