| 14000 | − | ( | 8 | × | 500 | + | 400 | × | 10 | + | ( | 600 | × | 30 | x | ) | ) | = | 3600 |
| 方程左边 = | 14000 | − | 8 | × | 500 | − | 400 | × | 10 | − | ( | 600 | × | 30 | x | ) |
| = | 14000 | − | 4000 | − | 4000 | − | ( | 600 | × | 30 | x | ) |
| = | 6000 | − | ( | 600 | × | 30 | x | ) |
| = | 6000 | − | 600 | × | 30 | x |
| = | 6000 | − | 18000 | x |
| 6000 | − | 18000 | x | = | 3600 |
| - | 18000 | x | = | 3600 | − | 6000 |
| - | 18000 | x | = | - | 2400 |
| 2400 | = | 18000 | x |
| 18000 | x | = | 2400 |
| x | = | 2400 | ÷ | 18000 |
| = | 2400 | × | 1 18000 |
| = | 2 | × | 1 15 |
| x | = | 2 15 |
| x | = | 0.133333 |