| x | ( | 1 | + | 20 100 | ) | × | 8 | ÷ | 10 | = | x | + | 64 |
| 方程左边 = | x | ( | 1 | + | 20 100 | ) | × | 4 5 |
| x | ( | 1 | + | 20 100 | ) | × | 4 5 | = | x | + | 64 |
| 方程左边 = | x | × | 1 | × | 4 5 | + | x | × | 20 100 | × | 4 5 |
| = | x | × | 4 5 | + | x | × | 4 25 |
| = | 24 25 | x |
24 25 | x | = | x | + | 64 |
24 25 | x | − | x | = | 64 |
| - | 1 25 | x | = | 64 |
| - | 64 | = | 1 25 | x |
1 25 | x | = | - | 64 |
| x | = | - | 64 | ÷ | 1 25 |
| = | - | 64 | × | 25 |
| x | = | - | 1600 |