| ( | x | − | 2000 | − | 5000 | × | 8 100 | ) | × | 75 100 | ÷ | 3000 | = | ( | x | − | 2000 | ) | ÷ | 75 100 | ÷ | 3000 | + | 1000 |
| 方程左边 = | ( | x | − | 2000 | − | 5000 | × | 8 100 | ) | × | 1 4000 |
| ( | x | − | 2000 | − | 5000 | × | 8 100 | ) | × | 1 4000 | = | ( | x | − | 2000 | ) | ÷ | 75 100 | ÷ | 3000 | + | 1000 |
| 方程左边 = | x | × | 1 4000 | − | 2000 | × | 1 4000 | − | 5000 | × | 8 100 | × | 1 4000 |
| = | x | × | 1 4000 | − | 1 2 | − | 1 10 |
| = | 1 4000 | x | − | 3 5 |
1 4000 | x | − | 3 5 | = | ( | x | − | 2000 | ) | ÷ | 75 100 | ÷ | 3000 | + | 1000 |
| 方程右边 = | ( | x | − | 2000 | ) | × | 1 2250 | + | 1000 |
1 4000 | x | − | 3 5 | = | ( | x | − | 2000 | ) | × | 1 2250 | + | 1000 |
| 方程右边 = | x | × | 1 2250 | − | 2000 | × | 1 2250 | + | 1000 |
| = | x | × | 1 2250 | − | 8 9 | + | 1000 |
| = | 1 2250 | x | + | 8992 9 |
1 4000 | x | − | 3 5 | = | 1 2250 | x | + | 8992 9 |
1 4000 | x | − | 1 2250 | x | = | 8992 9 | + | 3 5 |
| - | 7 36000 | x | = | 8992 9 | + | 3 5 |
| - | 7 36000 | x | = | 44987 45 |
| - | 44987 45 | = | 7 36000 | x |
7 36000 | x | = | - | 44987 45 |
| x | = | - | 44987 45 | ÷ | 7 36000 |
| = | - | 44987 45 | × | 36000 7 |
| = | - | 44987 | × | 800 7 |
| x | = | - | 35989600 7 |
| x | = | - 5141371.428571 |