| ( | x | − | 613 50 | ) | ÷ | x | × | 100 100 | = | 31 100 |
| 方程两边同时乘以: | x |
| ( | x | − | 613 50 | ) | × | 100 100 | = | 31 100 | x |
| x | × | 100 100 | − | 613 50 | × | 100 100 | = | 31 100 | x |
| x | × | 100 100 | − | 613 50 | = | 31 100 | x |
100 100 | x | − | 31 100 | x | = | 613 50 |
69 100 | x | = | 613 50 |
| x | = | 613 50 | ÷ | 69 100 |
| = | 613 50 | × | 100 69 |
| = | 613 | × | 2 69 |
| x | = | 1226 69 |
| x | = | 17.768116 |