| ( | - | 2 | x | + | 134 | ) | ( | 16 | + | 4 | x | ) | = | 870 |
| 方程左边 = | - | 2 | x | ( | 16 | + | 4 | x | ) | + | 134 | ( | 16 | + | 4 | x | ) |
| = | - | 2 | x | × | 16 | − | 2 | x | × | 4 | x | + | 134 | ( | 16 | + | 4 | x | ) |
| = | - | 32 | x | − | 8 | x | x | + | 134 | ( | 16 | + | 4 | x | ) |
| = | - | 32 | x | − | 8 | x | x | + | 134 | × | 16 | + | 134 | × | 4 | x |
| = | - | 32 | x | − | 8 | x | x | + | 2144 | + | 536 | x |
| = | 504 | x | − | 8 | x | x | + | 2144 |
| 504 | x | − | 8 | x | x | + | 2144 | = | 870 |