| 9206 | ÷ | X | + | 875 | ÷ | ( | 15 | − | X | ) | = | 15 |
| 方程两边同时乘以: | X |
| 9206 | + | 875 | ÷ | ( | 15 | − | X | ) | × | X | = | 15 | X |
| 方程两边同时乘以: | ( | 15 | − | X | ) |
| 9206 | ( | 15 | − | X | ) | + | 875 | X | = | 15 | X | ( | 15 | − | X | ) |
| 9206 | × | 15 | − | 9206 | X | + | 875 | X | = | 15 | X | ( | 15 | − | X | ) |
| 9206 | × | 15 | − | 9206 | X | + | 875 | X | = | 15 | X | × | 15 | − | 15 | X | X |
| 138090 | − | 9206 | X | + | 875 | X | = | 225 | X | − | 15 | X | X |
| 138090 | − | 8331 | X | = | 225 | X | − | 15 | X | X |