8 100 | x | + | 20 100 | ( | 1 | − | x | ) | = | 15 100 |
| 方程左边 = | 8 100 | x | + | 20 100 | × | 1 | − | 20 100 | x |
| = | 8 100 | x | + | 1 5 | − | 20 100 | x |
| = | - | 3 25 | x | + | 1 5 |
| - | 3 25 | x | + | 1 5 | = | 15 100 |
| - | 3 25 | x | = | 15 100 | − | 1 5 |
| - | 3 25 | x | = | - | 1 20 |
1 20 | = | 3 25 | x |
3 25 | x | = | 1 20 |
| x | = | 1 20 | ÷ | 3 25 |
| = | 1 20 | × | 25 3 |
| = | 1 4 | × | 5 3 |
| x | = | 5 12 |
| x | = | 0.416667 |