| ( | 3 | x | + | 144 | ) | ÷ | ( | 2 | x | + | 640 | ) | = | 1 | ÷ | 5 |
| 方程两边同时乘以: | ( | 2 | x | + | 640 | ) |
| ( | 3 | x | + | 144 | ) | = | 1 | ÷ | 5 | × | ( | 2 | x | + | 640 | ) |
| 3 | x | + | 144 | = | 1 | ÷ | 5 | × | ( | 2 | x | + | 640 | ) |
| 3 | x | + | 144 | = | 1 | ÷ | 5 | × | 2 | x | + | 1 | ÷ | 5 | × | 640 |
| 3 | x | + | 144 | = | 2 5 | x | + | 128 |
| 3 | x | − | 2 5 | x | = | 128 | − | 144 |
13 5 | x | = | 128 | − | 144 |
13 5 | x | = | - | 16 |
| x | = | - | 16 | ÷ | 13 5 |
| = | - | 16 | × | 5 13 |
| x | = | - | 80 13 |
| x | = | - 6.153846 |