| 6 | × | 2 | + | 4 | ( | x | − | 6 | ) | + | 6 | × | 2 | + | 4 | × | 4 | + | 8 | ( | 20 | − | x | − | 10 | ) | = | 64 |
| 方程左边 = | 12 | + | 4 | ( | x | − | 6 | ) | + | 12 | + | 16 | + | 8 | ( | 20 | − | x | − | 10 | ) |
| = | 40 | + | 4 | ( | x | − | 6 | ) | + | 8 | ( | 20 | − | x | − | 10 | ) |
| 40 | + | 4 | ( | x | − | 6 | ) | + | 8 | ( | 20 | − | x | − | 10 | ) | = | 64 |
| 方程左边 = | 40 | + | 4 | x | − | 4 | × | 6 | + | 8 | ( | 20 | − | x | − | 10 | ) |
| = | 40 | + | 4 | x | − | 24 | + | 8 | ( | 20 | − | x | − | 10 | ) |
| = | 16 | + | 4 | x | + | 8 | ( | 20 | − | x | − | 10 | ) |
| = | 16 | + | 4 | x | + | 8 | × | 20 | − | 8 | x | − | 8 | × | 10 |
| = | 16 | + | 4 | x | + | 160 | − | 8 | x | − | 80 |
| = | 96 | − | 4 | x |
| 96 | − | 4 | x | = | 64 |
| - | 4 | x | = | 64 | − | 96 |
| - | 4 | x | = | - | 32 |
| 32 | = | 4 | x |
| 4 | x | = | 32 |
| x | = | 32 | ÷ | 4 |
| = | 32 | × | 1 4 |
| = | 8 | × | 1 |
| x | = | 8 |