| ( | 1 | − | x | ÷ | 100 | ) | × | 7000 | × | 100 | ( | 1 | + | 4 5 | x | ÷ | 100 | ) | + | ( | 9000 | + | 50 | ÷ | 3 | × | x | ) | ( | 1 | − | 4 5 | x | ÷ | 100 | ) | × | 150 | = | 2050000 |
| 方程左边 = | ( | 1 | − | x | ÷ | 100 | ) | × | 700000 | ( | 1 | + | 4 5 | x | ÷ | 100 | ) | + | ( | 9000 | + | 50 | ÷ | 3 | × | x | ) | ( | 1 | − | 4 5 | x | ÷ | 100 | ) | × | 150 |
| ( | 1 | − | x | ÷ | 100 | ) | × | 700000 | ( | 1 | + | 4 5 | x | ÷ | 100 | ) | + | ( | 9000 | + | 50 | ÷ | 3 | × | x | ) | ( | 1 | − | 4 5 | x | ÷ | 100 | ) | × | 150 | = | 2050000 |
| 方程左边 = | 1 | × | 700000 | ( | 1 | + | 4 5 | x | ÷ | 100 | ) | − | x | ÷ | 100 | × | 700000 | ( | 1 | + | 4 5 | x | ÷ | 100 | ) | + | ( | 9000 | + | 50 | ÷ | 3 | × | x | ) | ( | 1 | − | 4 5 | x | ÷ | 100 | ) | × | 150 |
| = | 700000 | ( | 1 | + | 4 5 | x | ÷ | 100 | ) | − | x | × | 7000 | ( | 1 | + | 4 5 | x | ÷ | 100 | ) | + | ( | 9000 | + | 50 | ÷ | 3 | × | x | ) | ( | 1 | − | 4 5 | x | ÷ | 100 | ) | × | 150 |
| = | 700000 | × | 1 | + | 700000 | × | 4 5 | x | ÷ | 100 | − | x | × | 7000 | ( | 1 | + | 4 5 | x | ÷ | 100 | ) | + | ( | 9000 | + | 50 | ÷ | 3 | × | x | ) | ( | 1 | − | 4 5 | x | ÷ | 100 | ) | × | 150 |
| = | 700000 | + | 5600 | x | − | x | × | 7000 | ( | 1 | + | 4 5 | x | ÷ | 100 | ) | + | ( | 9000 | + | 50 | ÷ | 3 | × | x | ) | ( | 1 | − | 4 5 | x | ÷ | 100 | ) | × | 150 |
| = | 700000 | + | 5600 | x | − | x | × | 7000 | × | 1 | − | x | × | 7000 | × | 4 5 | x | ÷ | 100 | + | ( | 9000 | + | 50 | ÷ | 3 | × | x | ) |
| = | 700000 | + | 5600 | x | − | x | × | 7000 | − | x | × | 56 | x | + | ( | 9000 | + | 50 | ÷ | 3 | × | x | ) | ( | 1 | − | 4 5 | x | ÷ | 100 | ) | × | 150 |
| = | 700000 | − | 1400 | x | − | x | × | 56 | x | + | ( | 9000 | + | 50 | ÷ | 3 | × | x | ) | ( | 1 | − | 4 5 | x | ÷ | 100 | ) | × | 150 |
| = | 700000 | − | 1400 | x | − | x | × | 56 | x | + | 9000 | ( | 1 | − | 4 5 | x | ÷ | 100 | ) | × | 150 | + | 50 | ÷ | 3 | × | x |
| = | 700000 | − | 1400 | x | − | x | × | 56 | x | + | 1350000 | ( | 1 | − | 4 5 | x | ÷ | 100 | ) | + | 2500 | x | ( | 1 | − | 4 5 | x | ÷ | 100 | ) |
| = | 700000 | − | 1400 | x | − | x | × | 56 | x | + | 1350000 | × | 1 | − | 1350000 | × | 4 5 | x | ÷ | 100 |
| = | 700000 | − | 1400 | x | − | x | × | 56 | x | + | 1350000 | − | 10800 | x | + | 2500 | x | ( | 1 | − | 4 5 | x | ÷ | 100 | ) |
| = | 2050000 | − | 12200 | x | − | x | × | 56 | x | + | 2500 | x | ( | 1 | − | 4 5 | x | ÷ | 100 | ) |
| = | 2050000 | − | 12200 | x | − | x | × | 56 | x | + | 2500 | x | × | 1 | − | 2500 | x | × | 4 5 |
| = | 2050000 | − | 12200 | x | − | x | × | 56 | x | + | 2500 | x | − | 20 | x | x |
| = | 2050000 | − | 9700 | x | − | x | × | 56 | x | − | 20 | x | x |
| 2050000 | − | 9700 | x | − | x | × | 56 | x | − | 20 | x | x | = | 2050000 |