| 1 | ( | x | − | 6 | ) | + | 3 | ( | x | + | 10 | ) | = | 4 | × | 140 |
| 方程左边 = | 1 | x | − | 1 | × | 6 | + | 3 | ( | x | + | 10 | ) |
| = | 1 | x | − | 6 | + | 3 | ( | x | + | 10 | ) |
| = | 1 | x | − | 6 | + | 3 | x | + | 3 | × | 10 |
| = | 1 | x | − | 6 | + | 3 | x | + | 30 |
| = | 4 | x | + | 24 |
| 4 | x | + | 24 | = | 4 | × | 140 |
| 方程右边 = | 560 |
| 4 | x | + | 24 | = | 560 |
| 4 | x | = | 560 | − | 24 |
| 4 | x | = | 536 |
| x | = | 536 | ÷ | 4 |
| = | 536 | × | 1 4 |
| = | 134 | × | 1 |
| x | = | 134 |