| ( | x | − | 64 | ) | ÷ | ( | 240 | + | 4000 | − | x | ) | = | 6 5 |
| 方程两边同时乘以: | ( | 240 | + | 4000 | − | x | ) |
| ( | x | − | 64 | ) | = | 6 5 | ( | 240 | + | 4000 | − | x | ) |
| x | − | 64 | = | 6 5 | ( | 240 | + | 4000 | − | x | ) |
| x | − | 64 | = | 6 5 | × | 240 | + | 6 5 | × | 4000 | − | 6 5 | x |
| x | − | 64 | = | 288 | + | 4800 | − | 6 5 | x |
| x | − | 64 | = | 5088 | − | 6 5 | x |
| x | + | 6 5 | x | = | 5088 | + | 64 |
11 5 | x | = | 5088 | + | 64 |
11 5 | x | = | 5152 |
| x | = | 5152 | ÷ | 11 5 |
| = | 5152 | × | 5 11 |
| x | = | 25760 11 |
| x | = | 2341.818182 |