| ( | 64 | − | k | ) | ÷ | ( | 16 | − | k | ) | = | 16 25 |
| 方程两边同时乘以: | ( | 16 | − | k | ) |
| ( | 64 | − | k | ) | = | 16 25 | ( | 16 | − | k | ) |
| 64 | − | k | = | 16 25 | ( | 16 | − | k | ) |
| 64 | − | k | = | 16 25 | × | 16 | − | 16 25 | k |
| 64 | − | k | = | 256 25 | − | 16 25 | k |
| - | k | + | 16 25 | k | = | 256 25 | − | 64 |
| - | 9 25 | k | = | 256 25 | − | 64 |
| - | 9 25 | k | = | - | 1344 25 |
1344 25 | = | 9 25 | k |
9 25 | k | = | 1344 25 |
| k | = | 1344 25 | ÷ | 9 25 |
| = | 1344 25 | × | 25 9 |
| = | 448 | × | 1 3 |
| k | = | 448 3 |
| k | = | 149.333333 |