| 4 | + | 4 | ( | 1 | + | x | ) | + | 4 | ( | 1 | + | x | ) | × | 2 | = | 306 25 |
| 方程左边 = | 4 | + | 4 | ( | 1 | + | x | ) | + | 8 | ( | 1 | + | x | ) |
| 4 | + | 4 | ( | 1 | + | x | ) | + | 8 | ( | 1 | + | x | ) | = | 306 25 |
| 方程左边 = | 4 | + | 4 | × | 1 | + | 4 | x | + | 8 | ( | 1 | + | x | ) |
| = | 4 | + | 4 | + | 4 | x | + | 8 | ( | 1 | + | x | ) |
| = | 8 | + | 4 | x | + | 8 | ( | 1 | + | x | ) |
| = | 8 | + | 4 | x | + | 8 | × | 1 | + | 8 | x |
| = | 8 | + | 4 | x | + | 8 | + | 8 | x |
| = | 16 | + | 12 | x |
| 16 | + | 12 | x | = | 306 25 |
| 12 | x | = | 306 25 | − | 16 |
| 12 | x | = | - | 94 25 |
| x | = | - | 94 25 | ÷ | 12 |
| = | - | 94 25 | × | 1 12 |
| = | - | 47 25 | × | 1 6 |
| x | = | - | 47 150 |
| x | = | - 0.313333 |