| ( | x | ÷ | 4 | ) | ( | x | ÷ | 4 | ) | + | ( | 40 | − | x | ÷ | 4 | ) | ( | 40 | − | x | ÷ | 4 | ) | = | 58 |
| 方程左边 = | x | ÷ | 4 | × | ( | x | ÷ | 4 | ) | + | ( | 40 | − | x | ÷ | 4 | ) | ( | 40 | − | x | ÷ | 4 | ) |
| = | x | × | 1 4 | x | ÷ | 4 | + | ( | 40 | − | x | ÷ | 4 | ) | ( | 40 | − | x | ÷ | 4 | ) |
| = | x | × | 1 16 | x | + | ( | 40 | − | x | ÷ | 4 | ) | ( | 40 | − | x | ÷ | 4 | ) |
| = | x | × | 1 16 | x | + | 40 | ( | 40 | − | x | ÷ | 4 | ) | − | x | ÷ | 4 | × | ( | 40 | − | x | ÷ | 4 | ) |
| = | x | × | 1 16 | x | + | 40 | × | 40 | − | 40 | x | ÷ | 4 | − | x | × | 1 4 | ( | 40 | − | x | ÷ | 4 | ) |
| = | x | × | 1 16 | x | + | 1600 | − | 10 | x | − | x | × | 1 4 | ( | 40 | − | x | ÷ | 4 | ) |
| = | x | × | 1 16 | x | + | 1600 | − | 10 | x | − | x | × | 1 4 | × | 40 | + | x | × | 1 4 | x |
| = | x | × | 1 16 | x | + | 1600 | − | 10 | x | − | x | × | 10 | + | x | × | 1 16 | x |
| = | x | × | 1 16 | x | + | 1600 | − | 20 | x | + | x | × | 1 16 | x |
| x | × | 1 16 | x | + | 1600 | − | 20 | x | + | x | × | 1 16 | x | = | 58 |