| 128 | + | 128 | ( | 1 | + | x | ) | + | 128 | ( | 1 | + | x | ) | × | 2 | = | 608 |
| 方程左边 = | 128 | + | 128 | ( | 1 | + | x | ) | + | 256 | ( | 1 | + | x | ) |
| 128 | + | 128 | ( | 1 | + | x | ) | + | 256 | ( | 1 | + | x | ) | = | 608 |
| 方程左边 = | 128 | + | 128 | × | 1 | + | 128 | x | + | 256 | ( | 1 | + | x | ) |
| = | 128 | + | 128 | + | 128 | x | + | 256 | ( | 1 | + | x | ) |
| = | 256 | + | 128 | x | + | 256 | ( | 1 | + | x | ) |
| = | 256 | + | 128 | x | + | 256 | × | 1 | + | 256 | x |
| = | 256 | + | 128 | x | + | 256 | + | 256 | x |
| = | 512 | + | 384 | x |
| 512 | + | 384 | x | = | 608 |
| 384 | x | = | 608 | − | 512 |
| 384 | x | = | 96 |
| x | = | 96 | ÷ | 384 |
| = | 96 | × | 1 384 |
| = | 1 | × | 1 4 |
| x | = | 1 4 |
| x | = | 0.25 |