| 5 | ( | x | − | 4 | ) | + | 80 | = | 23 25 | ( | 5 | x | + | 80 | ) |
| 方程左边 = | 5 | x | − | 5 | × | 4 | + | 80 |
| = | 5 | x | − | 20 | + | 80 |
| = | 5 | x | + | 60 |
| 5 | x | + | 60 | = | 23 25 | ( | 5 | x | + | 80 | ) |
| 方程右边 = | 23 25 | × | 5 | x | + | 23 25 | × | 80 |
| = | 23 5 | x | + | 368 5 |
| 5 | x | + | 60 | = | 23 5 | x | + | 368 5 |
| 5 | x | − | 23 5 | x | = | 368 5 | − | 60 |
2 5 | x | = | 368 5 | − | 60 |
2 5 | x | = | 68 5 |
| x | = | 68 5 | ÷ | 2 5 |
| = | 68 5 | × | 5 2 |
| = | 34 | × | 1 |
| x | = | 34 |