| 16 | x | + | 6 | ( | 100 | − | x | ) | = | 20 | x | + | 15 | ( | 100 | − | 2 | x | ) |
| 方程左边 = | 16 | x | + | 6 | × | 100 | − | 6 | x |
| = | 16 | x | + | 600 | − | 6 | x |
| = | 10 | x | + | 600 |
| 10 | x | + | 600 | = | 20 | x | + | 15 | ( | 100 | − | 2 | x | ) |
| 方程右边 = | 20 | x | + | 15 | × | 100 | − | 15 | × | 2 | x |
| = | 20 | x | + | 1500 | − | 30 | x |
| = | - | 10 | x | + | 1500 |
| 10 | x | + | 600 | = | - | 10 | x | + | 1500 |
| 10 | x | + | 10 | x | = | 1500 | − | 600 |
| 20 | x | = | 1500 | − | 600 |
| 20 | x | = | 900 |
| x | = | 900 | ÷ | 20 |
| = | 900 | × | 1 20 |
| = | 45 | × | 1 |
| x | = | 45 |