| ( | 10 | + | 2 | ( | x | − | 1 | ) | ) | ( | 76 | − | 4 | ( | x | − | 1 | ) | ) | = | 1080 |
| 方程左边 = | 10 | ( | 76 | − | 4 | ( | x | − | 1 | ) | ) | + | 2 | ( | x | − | 1 | ) | ( | 76 | − | 4 | ( | x | − | 1 | ) | ) |
| = | 10 | × | 76 | − | 10 | × | 4 | ( | x | − | 1 | ) | + | 2 | ( | x | − | 1 | ) | ( | 76 | − | 4 | ( | x | − | 1 | ) | ) |
| = | 760 | − | 40 | ( | x | − | 1 | ) | + | 2 | ( | x | − | 1 | ) | ( | 76 | − | 4 | ( | x | − | 1 | ) | ) |
| = | 760 | − | 40 | x | + | 40 | × | 1 | + | 2 | ( | x | − | 1 | ) | ( | 76 | − | 4 | ( | x | − | 1 | ) | ) |
| = | 760 | − | 40 | x | + | 40 | + | 2 | ( | x | − | 1 | ) | ( | 76 | − | 4 | ( | x | − | 1 | ) | ) |
| = | 800 | − | 40 | x | + | 2 | ( | x | − | 1 | ) | ( | 76 | − | 4 | ( | x | − | 1 | ) | ) |
| = | 800 | − | 40 | x | + | 2 | x | ( | 76 | − | 4 | ( | x | − | 1 | ) | ) | − | 2 | × | 1 | ( | 76 | − | 4 | ( | x | − | 1 | ) | ) |
| = | 800 | − | 40 | x | + | 2 | x | ( | 76 | − | 4 | ( | x | − | 1 | ) | ) | − | 2 | ( | 76 | − | 4 | ( | x | − | 1 | ) | ) |
| = | 800 | − | 40 | x | + | 2 | x | × | 76 | − | 2 | x | × | 4 | ( | x | − | 1 | ) | − | 2 | ( | 76 | − | 4 | ( | x | − | 1 | ) | ) |
| = | 800 | − | 40 | x | + | 152 | x | − | 8 | x | ( | x | − | 1 | ) | − | 2 | ( | 76 | − | 4 | ( | x | − | 1 | ) | ) |
| = | 800 | + | 112 | x | − | 8 | x | ( | x | − | 1 | ) | − | 2 | ( | 76 | − | 4 | ( | x | − | 1 | ) | ) |
| = | 800 | + | 112 | x | − | 8 | x | x | + | 8 | x | × | 1 | − | 2 | ( | 76 | − | 4 | ( | x | − | 1 | ) | ) |
| = | 800 | + | 112 | x | − | 8 | x | x | + | 8 | x | − | 2 | ( | 76 | − | 4 | ( | x | − | 1 | ) | ) |
| = | 800 | + | 120 | x | − | 8 | x | x | − | 2 | ( | 76 | − | 4 | ( | x | − | 1 | ) | ) |
| = | 800 | + | 120 | x | − | 8 | x | x | − | 2 | × | 76 | + | 2 | × | 4 | ( | x | − | 1 | ) |
| = | 800 | + | 120 | x | − | 8 | x | x | − | 152 | + | 8 | ( | x | − | 1 | ) |
| = | 648 | + | 120 | x | − | 8 | x | x | + | 8 | ( | x | − | 1 | ) |
| = | 648 | + | 120 | x | − | 8 | x | x | + | 8 | x | − | 8 | × | 1 |
| = | 648 | + | 120 | x | − | 8 | x | x | + | 8 | x | − | 8 |
| = | 640 | + | 128 | x | − | 8 | x | x |
| 640 | + | 128 | x | − | 8 | x | x | = | 1080 |