| ( | 13 | − | x | ) | ÷ | ( | 13 100 | − | 14 100 | ) | = | 256 125 | ÷ | 2527 500 |
| 方程两边同时乘以: | ( | 13 100 | − | 14 100 | ) |
| ( | 13 | − | x | ) | = | 256 125 | ÷ | 2527 500 | × | ( | 13 100 | − | 14 100 | ) |
| 13 | − | x | = | 256 125 | ÷ | 2527 500 | × | ( | 13 100 | − | 14 100 | ) |
| 13 | − | x | = | 256 125 | ÷ | 2527 500 | × | 13 100 | − | 256 125 | ÷ | 2527 500 | × | 14 100 |
| 13 | − | x | = | 3328 63175 | − | 512 9025 |
| 13 | − | x | = | - | 256 63175 |
| - | x | = | - | 256 63175 | − | 13 |
| - | x | = | - | 821531 63175 |
821531 63175 | = | x |
| x | = | 821531 63175 |