| ( | x | + | 4 | ÷ | 3 | ) | ( | x | + | 4 | ÷ | 3 | ) | + | 9 | x | x | = | 4 |
| 方程左边 = | x | ( | x | + | 4 | ÷ | 3 | ) | + | 4 | ÷ | 3 | × | ( | x | + | 4 | ÷ | 3 | ) | + | 9 | x | x |
| = | x | ( | x | + | 4 | ÷ | 3 | ) | + | 4 3 | ( | x | + | 4 | ÷ | 3 | ) | + | 9 | x | x |
| = | x | x | + | x | × | 4 | ÷ | 3 | + | 4 3 | ( | x | + | 4 | ÷ | 3 | ) | + | 9 | x | x |
| = | x | x | + | x | × | 4 3 | + | 4 3 | ( | x | + | 4 | ÷ | 3 | ) | + | 9 | x | x |
| = | x | x | + | 4 3 | x | + | 4 3 | x | + | 4 3 | × | 4 | ÷ | 3 | + | 9 | x | x |
| = | x | x | + | 4 3 | x | + | 4 3 | x | + | 16 9 | + | 9 | x | x |
| = | x | x | + | 8 3 | x | + | 16 9 | + | 9 | x | x |
| x | x | + | 8 3 | x | + | 16 9 | + | 9 | x | x | = | 4 |