| 16000 | + | ( | - | x | ÷ | 2 | + | 55 | ) | ( | 5 | ( | x | − | 30 | ) | + | 40 | ) | = | 4250 |
| 方程左边 = | 16000 | − | x | ÷ | 2 | × | ( | 5 | ( | x | − | 30 | ) | + | 40 | ) | + | 55 | ( | 5 | ( | x | − | 30 | ) | + | 40 | ) |
| = | 16000 | − | x | × | 1 2 | × | 5 | ( | x | − | 30 | ) | − | x | × | 1 2 | × | 40 | + | 55 | ( | 5 | ( | x | − | 30 | ) | + | 40 | ) |
| = | 16000 | − | x | × | 5 2 | ( | x | − | 30 | ) | − | x | × | 20 | + | 55 | ( | 5 | ( | x | − | 30 | ) | + | 40 | ) |
| = | 16000 | − | x | × | 5 2 | x | + | x | × | 5 2 | × | 30 | − | 20 | x | + | 55 | ( | 5 | ( | x | − | 30 | ) | + | 40 | ) |
| = | 16000 | − | x | × | 5 2 | x | + | x | × | 75 | − | 20 | x | + | 55 | ( | 5 | ( | x | − | 30 | ) | + | 40 | ) |
| = | 16000 | − | x | × | 5 2 | x | + | 55 | x | + | 55 | ( | 5 | ( | x | − | 30 | ) | + | 40 | ) |
| = | 16000 | − | x | × | 5 2 | x | + | 55 | x | + | 55 | × | 5 | ( | x | − | 30 | ) | + | 55 | × | 40 |
| = | 16000 | − | x | × | 5 2 | x | + | 55 | x | + | 275 | ( | x | − | 30 | ) | + | 2200 |
| = | 18200 | − | x | × | 5 2 | x | + | 55 | x | + | 275 | ( | x | − | 30 | ) |
| = | 18200 | − | x | × | 5 2 | x | + | 55 | x | + | 275 | x | − | 275 | × | 30 |
| = | 18200 | − | x | × | 5 2 | x | + | 55 | x | + | 275 | x | − | 8250 |
| = | 9950 | − | x | × | 5 2 | x | + | 330 | x |
| 9950 | − | x | × | 5 2 | x | + | 330 | x | = | 4250 |