| ( | 15 | ÷ | 4 | + | 15 | ÷ | ( | 2 | x | − | 4 | ) | ) | x | = | 10 |
| 15 | ÷ | 4 | × | x | + | 15 | ÷ | ( | 2 | x | − | 4 | ) | × | x | = | 10 |
15 4 | x | + | 15 | ÷ | ( | 2 | x | − | 4 | ) | × | x | = | 10 |
| 方程两边同时乘以: | ( | 2 | x | − | 4 | ) |
15 4 | x | ( | 2 | x | − | 4 | ) | + | 15 | x | = | 10 | ( | 2 | x | − | 4 | ) |
15 4 | x | × | 2 | x | − | 15 4 | x | × | 4 | + | 15 | x | = | 10 | ( | 2 | x | − | 4 | ) |
15 4 | x | × | 2 | x | − | 15 4 | x | × | 4 | + | 15 | x | = | 10 | × | 2 | x | − | 10 | × | 4 |
15 2 | x | x | − | 15 | x | + | 15 | x | = | 20 | x | − | 40 |
15 2 | x | x | − | 0 | x | = | 20 | x | − | 40 |