| x | = | 2 5 | ( | ( | 35 | x | − | 4 | ) | ( | 35 | x | − | 4 | ) | ) |
| 方程右边 = | 2 5 | ( | 35 | x | − | 4 | ) | ( | 35 | x | − | 4 | ) |
| = | 2 5 | × | 35 | x | ( | 35 | x | − | 4 | ) | − | 2 5 | × | 4 | ( | 35 | x | − | 4 | ) |
| = | 14 | x | ( | 35 | x | − | 4 | ) | − | 8 5 | ( | 35 | x | − | 4 | ) |
| = | 14 | x | × | 35 | x | − | 14 | x | × | 4 | − | 8 5 | ( | 35 | x | − | 4 | ) |
| = | 490 | x | x | − | 56 | x | − | 8 5 | ( | 35 | x | − | 4 | ) |
| = | 490 | x | x | − | 56 | x | − | 8 5 | × | 35 | x | + | 8 5 | × | 4 |
| = | 490 | x | x | − | 56 | x | − | 56 | x | + | 32 5 |
| = | 490 | x | x | − | 112 | x | + | 32 5 |
| x | = | 490 | x | x | − | 112 | x | + | 32 5 |