| ( | 6 | x | + | 12 | ) | x | ( | 1 | + | 30 100 | ) | = | 8 | x | + | 10 |
| 方程左边 = | 6 | x | x | ( | 1 | + | 30 100 | ) | + | 12 | x | ( | 1 | + | 30 100 | ) |
| = | 6 | x | x | × | 1 | + | 6 | x | x | × | 30 100 | + | 12 | x | ( | 1 | + | 30 100 | ) |
| = | 6 | x | x | + | 9 5 | x | x | + | 12 | x | ( | 1 | + | 30 100 | ) |
| = | 6 | x | x | + | 9 5 | x | x | + | 12 | x | × | 1 | + | 12 | x | × | 30 100 |
| = | 6 | x | x | + | 9 5 | x | x | + | 12 | x | + | 18 5 | x |
| = | 6 | x | x | + | 9 5 | x | x | + | 78 5 | x |
| 6 | x | x | + | 9 5 | x | x | + | 78 5 | x | = | 8 | x | + | 10 |