| ( | 3 | x | − | 1 | ) | ÷ | ( | - | 5 | ) | = | ( | x | + | 3 | ) | ÷ | 15 |
| 方程两边同时乘以: | ( | - | 5 | ) |
| ( | 3 | x | − | 1 | ) | = | ( | x | + | 3 | ) | ÷ | 15 | × | ( | - | 5 | ) |
| 3 | x | − | 1 | = | ( | x | + | 3 | ) | ÷ | 15 | × | ( | - | 5 | ) |
| 3 | x | − | 1 | = | x | ÷ | 15 | × | ( | - | 5 | ) | + | 3 | ÷ | 15 | × | ( | - | 5 | ) |
| 3 | x | − | 1 | = | x | × | 1 15 | ( | - | 5 | ) | + | 1 5 | ( | - | 5 | ) |
| 3 | x | − | 1 | = | - | x | × | 1 15 | × | 5 | + | 1 5 | ( | - | 5 | ) |
| 3 | x | − | 1 | = | - | x | × | 1 3 | + | 1 5 | ( | - | 5 | ) |
| 3 | x | − | 1 | = | - | 1 3 | x | − | 1 5 | × | 5 |
| 3 | x | − | 1 | = | - | 1 3 | x | − | 1 |
| 3 | x | + | 1 3 | x | = | - | 1 | + | 1 |
10 3 | x | = | - | 1 | + | 1 |
10 3 | x | = | - | 0 |
| x | = | - | 0 | ÷ | 10 3 |
| = | - | 0 | × | 3 10 |
| x | = | 0 |