| 100 | ( | x | − | 104 | ) | = | 104 | ( | x | − | 105 | ) |
| 方程左边 = | 100 | x | − | 100 | × | 104 |
| = | 100 | x | − | 10400 |
| 100 | x | − | 10400 | = | 104 | ( | x | − | 105 | ) |
| 方程右边 = | 104 | x | − | 104 | × | 105 |
| = | 104 | x | − | 10920 |
| 100 | x | − | 10400 | = | 104 | x | − | 10920 |
| 100 | x | − | 104 | x | = | - | 10920 | + | 10400 |
| - | 4 | x | = | - | 10920 | + | 10400 |
| - | 4 | x | = | - | 520 |
| 520 | = | 4 | x |
| 4 | x | = | 520 |
| x | = | 520 | ÷ | 4 |
| = | 520 | × | 1 4 |
| = | 130 | × | 1 |
| x | = | 130 |