| 6 | x | + | 4 | ( | x | − | 5 | ) | + | 5 | ( | x | − | 2 | ) | = | 60 |
| 方程左边 = | 6 | x | + | 4 | x | − | 4 | × | 5 | + | 5 | ( | x | − | 2 | ) |
| = | 6 | x | + | 4 | x | − | 20 | + | 5 | ( | x | − | 2 | ) |
| = | 10 | x | − | 20 | + | 5 | ( | x | − | 2 | ) |
| = | 10 | x | − | 20 | + | 5 | x | − | 5 | × | 2 |
| = | 10 | x | − | 20 | + | 5 | x | − | 10 |
| = | 15 | x | − | 30 |
| 15 | x | − | 30 | = | 60 |
| 15 | x | = | 60 | + | 30 |
| 15 | x | = | 90 |
| x | = | 90 | ÷ | 15 |
| = | 90 | × | 1 15 |
| = | 6 | × | 1 |
| x | = | 6 |