| 6 | ( | x | + | 150 | ) | + | 8 | x | = | 20 | ( | x | + | 150 | + | x | ) | ÷ | 3 |
| 方程左边 = | 6 | x | + | 6 | × | 150 | + | 8 | x |
| = | 6 | x | + | 900 | + | 8 | x |
| = | 14 | x | + | 900 |
| 14 | x | + | 900 | = | 20 | ( | x | + | 150 | + | x | ) | ÷ | 3 |
| 方程右边 = | 20 3 | ( | x | + | 150 | + | x | ) |
| 14 | x | + | 900 | = | 20 3 | ( | x | + | 150 | + | x | ) |
| 方程右边 = | 20 3 | x | + | 20 3 | × | 150 | + | 20 3 | x |
| = | 20 3 | x | + | 1000 | + | 20 3 | x |
| = | 40 3 | x | + | 1000 |
| 14 | x | + | 900 | = | 40 3 | x | + | 1000 |
| 14 | x | − | 40 3 | x | = | 1000 | − | 900 |
2 3 | x | = | 1000 | − | 900 |
2 3 | x | = | 100 |
| x | = | 100 | ÷ | 2 3 |
| = | 100 | × | 3 2 |
| = | 50 | × | 3 |
| x | = | 150 |