| 30 | ÷ | ( | x | − | 8 100 | ) | = | - | 360 | ÷ | ( | 10 100 | − | x | ) |
| 方程两边同时乘以: | ( | x | − | 8 100 | ) | , | ( | 10 100 | − | x | ) |
| 30 | ( | 10 100 | − | x | ) | = | - | 360 | ( | x | − | 8 100 | ) |
| 30 | × | 10 100 | − | 30 | x | = | - | 360 | ( | x | − | 8 100 | ) |
| 30 | × | 10 100 | − | 30 | x | = | - | 360 | x | + | 360 | × | 8 100 |
| 3 | − | 30 | x | = | - | 360 | x | + | 144 5 |
| - | 30 | x | + | 360 | x | = | 144 5 | − | 3 |
| 330 | x | = | 144 5 | − | 3 |
| 330 | x | = | 129 5 |
| x | = | 129 5 | ÷ | 330 |
| = | 129 5 | × | 1 330 |
| = | 43 5 | × | 1 110 |
| x | = | 43 550 |
| x | = | 0.078182 |