| ( | 480 | ÷ | x | ) | − | ( | 2 | ÷ | 3 | ) | = | ( | 1 | ÷ | 3 | ) | + | ( | 240 | ÷ | x | ) | + | ( | 240 | ÷ | ( | 4 | x | ÷ | 3 | ) | ) |
| 480 | ÷ | x | − | ( | 2 | ÷ | 3 | ) | = | ( | 1 | ÷ | 3 | ) | + | ( | 240 | ÷ | x | ) | + | ( | 240 | ÷ | ( | 4 | x | ÷ | 3 | ) | ) |
| 480 | ÷ | x | − | ( | 2 | ÷ | 3 | ) | = | 1 | ÷ | 3 | + | ( | 240 | ÷ | x | ) | + | ( | 240 | ÷ | ( | 4 | x | ÷ | 3 | ) | ) |
| 480 | ÷ | x | − | ( | 2 | ÷ | 3 | ) | = | 1 3 | + | ( | 240 | ÷ | x | ) | + | ( | 240 | ÷ | ( | 4 | x | ÷ | 3 | ) | ) |
| 方程两边同时乘以: | x |
| 480 | − | ( | 2 | ÷ | 3 | ) | x | = | 1 3 | x | + | ( | 240 | ÷ | 1 | ) | × | 1 | + | ( | 240 | ÷ | ( | 4 | x | ÷ | 3 | ) | ) | x |
| 480 | − | 2 | ÷ | 3 | × | x | = | 1 3 | x | + | ( | 240 | ÷ | 1 | ) | × | 1 | + | ( | 240 | ÷ | ( | 4 | x | ÷ | 3 | ) | ) | x |
| 480 | − | 2 | ÷ | 3 | × | x | = | 1 3 | x | + | 240 | ÷ | 1 | × | 1 | + | ( | 240 | ÷ | ( | 4 | x | ÷ | 3 | ) | ) | x |
| 480 | − | 2 3 | x | = | 1 3 | x | + | 240 | + | ( | 240 | ÷ | ( | 4 | x | ÷ | 3 | ) | ) | x |
| 480 | − | 2 3 | x | = | 1 3 | x | + | 240 | + | 240 | ÷ | ( | 4 | x | ÷ | 3 | ) | × | x |
| 方程两边同时乘以: | ( | 4 | × | 1 | ÷ | 3 | ) |
| 480 | ( | 4 | × | 1 | ÷ | 3 | ) | − | 2 3 | x | ( | 4 | × | 1 | ÷ | 3 | ) | = | 1 3 | x | ( | 4 | × | 1 | ÷ | 3 | ) | + | 240 | ( | 4 | × | 1 | ÷ | 3 | ) | + | 240 | × | 1 |
| 480 | × | 4 | × | 1 | ÷ | 3 | − | 2 3 | x | ( | 4 | × | 1 | ÷ | 3 | ) | = | 1 3 | x | ( | 4 | × | 1 | ÷ | 3 | ) | + | 240 | ( | 4 | × | 1 | ÷ | 3 | ) | + | 240 | × | 1 |
| 480 | × | 4 | × | 1 | ÷ | 3 | − | 2 3 | x | ( | 4 | × | 1 | ÷ | 3 | ) | = | 1 3 | x | × | 4 | × | 1 | ÷ | 3 | + | 240 | ( | 4 | × | 1 | ÷ | 3 | ) | + | 240 | × | 1 |
| 640 | − | 2 3 | x | ( | 4 | × | 1 | ÷ | 3 | ) | = | 4 9 | x | + | 240 | ( | 4 | × | 1 | ÷ | 3 | ) | + | 240 |
| 640 | − | 2 3 | x | × | 4 | × | 1 | ÷ | 3 | = | 4 9 | x | + | 240 | ( | 4 | × | 1 | ÷ | 3 | ) | + | 240 |
| 640 | − | 2 3 | x | × | 4 | × | 1 | ÷ | 3 | = | 4 9 | x | + | 240 | × | 4 | × | 1 | ÷ | 3 | + | 240 |
| 640 | − | 8 9 | x | = | 4 9 | x | + | 320 | + | 240 |
| 640 | − | 8 9 | x | = | 4 9 | x | + | 560 |
| - | 8 9 | x | − | 4 9 | x | = | 560 | − | 640 |
| - | 4 3 | x | = | 560 | − | 640 |
| - | 4 3 | x | = | - | 80 |
| 80 | = | 4 3 | x |
4 3 | x | = | 80 |
| x | = | 80 | ÷ | 4 3 |
| = | 80 | × | 3 4 |
| = | 20 | × | 3 |
| x | = | 60 |