| ( | 5000 | + | x | ) | ÷ | ( | ( | 11000 | + | x | ) | ÷ | 3 4 | × | 1 4 | ) | = | 2 5 |
| 方程两边同时乘以: | ( | ( | 11000 | + | x | ) | ÷ | 3 4 | × | 1 4 | ) |
| ( | 5000 | + | x | ) | = | 2 5 | ( | ( | 11000 | + | x | ) | ÷ | 3 4 | × | 1 4 | ) |
| 5000 | + | x | = | 2 5 | ( | ( | 11000 | + | x | ) | ÷ | 3 4 | × | 1 4 | ) |
| 5000 | + | x | = | 2 5 | ( | 11000 | + | x | ) | ÷ | 3 4 | × | 1 4 |
| 5000 | + | x | = | 2 15 | ( | 11000 | + | x | ) |
| 5000 | + | x | = | 2 15 | × | 11000 | + | 2 15 | x |
| 5000 | + | x | = | 4400 3 | + | 2 15 | x |
| x | − | 2 15 | x | = | 4400 3 | − | 5000 |
13 15 | x | = | 4400 3 | − | 5000 |
13 15 | x | = | - | 10600 3 |
| x | = | - | 10600 3 | ÷ | 13 15 |
| = | - | 10600 3 | × | 15 13 |
| = | - | 10600 | × | 5 13 |
| x | = | - | 53000 13 |
| x | = | - 4076.923077 |