| ( | 6 | − | X | ) | ÷ | ( | 6 | − | 7 | ) | = | 253 2000 |
| 方程两边同时乘以: | ( | 6 | − | 7 | ) |
| ( | 6 | − | X | ) | = | 253 2000 | ( | 6 | − | 7 | ) |
| 6 | − | X | = | 253 2000 | ( | 6 | − | 7 | ) |
| 6 | − | X | = | 253 2000 | × | 6 | − | 253 2000 | × | 7 |
| 6 | − | X | = | 759 1000 | − | 1771 2000 |
| 6 | − | X | = | - | 253 2000 |
| - | X | = | - | 253 2000 | − | 6 |
| - | X | = | - | 12253 2000 |
12253 2000 | = | X |
| X | = | 12253 2000 |