| 1600 | ( | 1 | + | x | ) | ( | ( | 80 | ÷ | 3 | ) | ( | 1 | − | 1 5 | x | ) | − | 12 | × | 5 4 | ) | = | 8000 |
| 方程左边 = | 1600 | × | 1 | ( | ( | 80 | ÷ | 3 | ) | ( | 1 | − | 1 5 | x | ) | − | 12 | × | 5 4 | ) | + | 1600 | x | ( | ( | 80 | ÷ | 3 | ) | ( | 1 | − | 1 5 | x | ) | − | 12 | × | 5 4 | ) |
| = | 1600 | ( | ( | 80 | ÷ | 3 | ) | ( | 1 | − | 1 5 | x | ) | − | 12 | × | 5 4 | ) | + | 1600 | x | ( | ( | 80 | ÷ | 3 | ) | ( | 1 | − | 1 5 | x | ) | − | 12 | × | 5 4 | ) |
| = | 1600 | ( | 80 | ÷ | 3 | ) | ( | 1 | − | 1 5 | x | ) | − | 1600 | × | 12 | × | 5 4 | + | 1600 | x | ( | ( | 80 | ÷ | 3 | ) | ( | 1 | − | 1 5 | x | ) | − | 12 | × | 5 4 | ) |
| = | 1600 | ( | 80 | ÷ | 3 | ) | ( | 1 | − | 1 5 | x | ) | − | 24000 | + | 1600 | x | ( | ( | 80 | ÷ | 3 | ) | ( | 1 | − | 1 5 | x | ) | − | 12 | × | 5 4 | ) |
| = | 1600 | × | 80 | ÷ | 3 | × | ( | 1 | − | 1 5 | x | ) | − | 24000 | + | 1600 | x | ( | ( | 80 | ÷ | 3 | ) | ( | 1 | − | 1 5 | x | ) | − | 12 | × | 5 4 | ) |
| = | 128000 3 | ( | 1 | − | 1 5 | x | ) | − | 24000 | + | 1600 | x | ( | ( | 80 | ÷ | 3 | ) | ( | 1 | − | 1 5 | x | ) | − | 12 | × | 5 4 | ) |
| = | 128000 3 | × | 1 | − | 128000 3 | × | 1 5 | x | − | 24000 | + | 1600 | x | ( | ( | 80 | ÷ | 3 | ) | ( | 1 | − | 1 5 | x | ) | − | 12 | × | 5 4 | ) |
| = | 128000 3 | − | 25600 3 | x | − | 24000 | + | 1600 | x | ( | ( | 80 | ÷ | 3 | ) | ( | 1 | − | 1 5 | x | ) | − | 12 | × | 5 4 | ) |
| = | 56000 3 | − | 25600 3 | x | + | 1600 | x | ( | ( | 80 | ÷ | 3 | ) | ( | 1 | − | 1 5 | x | ) | − | 12 | × | 5 4 | ) |
| = | 56000 3 | − | 25600 3 | x | + | 1600 | x | ( | 80 | ÷ | 3 | ) | ( | 1 | − | 1 5 | x | ) | − | 1600 | x | × | 12 | × | 5 4 |
| = | 56000 3 | − | 25600 3 | x | + | 1600 | x | ( | 80 | ÷ | 3 | ) | ( | 1 | − | 1 5 | x | ) | − | 24000 | x |
| = | 56000 3 | − | 97600 3 | x | + | 1600 | x | ( | 80 | ÷ | 3 | ) | ( | 1 | − | 1 5 | x | ) |
| = | 56000 3 | − | 97600 3 | x | + | 1600 | x | × | 80 | ÷ | 3 | × | ( | 1 | − | 1 5 | x | ) |
| = | 56000 3 | − | 97600 3 | x | + | 128000 3 | x | ( | 1 | − | 1 5 | x | ) |
| = | 56000 3 | − | 97600 3 | x | + | 128000 3 | x | × | 1 | − | 128000 3 | x | × | 1 5 | x |
| = | 56000 3 | − | 97600 3 | x | + | 128000 3 | x | − | 25600 3 | x | x |
| = | 56000 3 | + | 30400 3 | x | − | 25600 3 | x | x |
56000 3 | + | 30400 3 | x | − | 25600 3 | x | x | = | 8000 |