| x | − | ( | x | − | 64 | ) | × | 13 100 | − | 64 | = | 21 100 | x |
| 方程左边 = | x | − | x | × | 13 100 | + | 64 | × | 13 100 | − | 64 |
| = | x | − | x | × | 13 100 | + | 208 25 | − | 64 |
| = | 87 100 | x | − | 1392 25 |
87 100 | x | − | 1392 25 | = | 21 100 | x |
87 100 | x | − | 21 100 | x | = | 1392 25 |
33 50 | x | = | 1392 25 |
| x | = | 1392 25 | ÷ | 33 50 |
| = | 1392 25 | × | 50 33 |
| = | 464 | × | 2 11 |
| x | = | 928 11 |
| x | = | 84.363636 |