| 9 | + | ( | 15 | ÷ | 4 | + | 3 | ÷ | 2 | × | x | ) | ( | 15 | ÷ | 4 | + | 3 | ÷ | 2 | × | x | ) | = | 5 | ( | 6 | ÷ | 5 | + | 6 | ÷ | 5 | × | x | ) | ( | 6 | ÷ | 5 | + | 6 | ÷ | 5 | × | x | ) |
| 方程左边 = | 9 | + | 15 | ÷ | 4 | × | ( | 15 | ÷ | 4 | + | 3 | ÷ | 2 | × | x | ) | + | 3 | ÷ | 2 | × | x | ( | 15 | ÷ | 4 | + | 3 | ÷ | 2 | × | x | ) |
| = | 9 | + | 15 4 | ( | 15 | ÷ | 4 | + | 3 | ÷ | 2 | × | x | ) | + | 3 2 | x | ( | 15 | ÷ | 4 | + | 3 | ÷ | 2 | × | x | ) |
| = | 9 | + | 15 4 | × | 15 | ÷ | 4 | + | 15 4 | × | 3 | ÷ | 2 | × | x | + | 3 2 | x | ( | 15 | ÷ | 4 | + | 3 | ÷ | 2 | × | x | ) |
| = | 9 | + | 225 16 | + | 45 8 | x | + | 3 2 | x | ( | 15 | ÷ | 4 | + | 3 | ÷ | 2 | × | x | ) |
| = | 369 16 | + | 45 8 | x | + | 3 2 | x | ( | 15 | ÷ | 4 | + | 3 | ÷ | 2 | × | x | ) |
| = | 369 16 | + | 45 8 | x | + | 3 2 | x | × | 15 | ÷ | 4 | + | 3 2 | x | × | 3 | ÷ | 2 | × | x |
| = | 369 16 | + | 45 8 | x | + | 45 8 | x | + | 9 4 | x | x |
| = | 369 16 | + | 45 4 | x | + | 9 4 | x | x |
369 16 | + | 45 4 | x | + | 9 4 | x | x | = | 5 | ( | 6 | ÷ | 5 | + | 6 | ÷ | 5 | × | x | ) | ( | 6 | ÷ | 5 | + | 6 | ÷ | 5 | × | x | ) |
| 方程右边 = | 5 | × | 6 | ÷ | 5 | × | ( | 6 | ÷ | 5 | + | 6 | ÷ | 5 | × | x | ) | + | 5 | × | 6 | ÷ | 5 | × | x | ( | 6 | ÷ | 5 | + | 6 | ÷ | 5 | × | x | ) |
| = | 6 | ( | 6 | ÷ | 5 | + | 6 | ÷ | 5 | × | x | ) | + | 6 | x | ( | 6 | ÷ | 5 | + | 6 | ÷ | 5 | × | x | ) |
| = | 6 | × | 6 | ÷ | 5 | + | 6 | × | 6 | ÷ | 5 | × | x | + | 6 | x | ( | 6 | ÷ | 5 | + | 6 | ÷ | 5 | × | x | ) |
| = | 36 5 | + | 36 5 | x | + | 6 | x | ( | 6 | ÷ | 5 | + | 6 | ÷ | 5 | × | x | ) |
| = | 36 5 | + | 36 5 | x | + | 6 | x | × | 6 | ÷ | 5 | + | 6 | x | × | 6 | ÷ | 5 | × | x |
| = | 36 5 | + | 36 5 | x | + | 36 5 | x | + | 36 5 | x | x |
| = | 36 5 | + | 72 5 | x | + | 36 5 | x | x |
369 16 | + | 45 4 | x | + | 9 4 | x | x | = | 36 5 | + | 72 5 | x | + | 36 5 | x | x |
| x1= | - | 47 22 |
| x2= | 3 2 |