| 3 | ( | 2 | x | + | 5 | ) | = | 2 | ( | 4 | x | + | 3 | ) | × | 13 |
| 方程左边 = | 3 | × | 2 | x | + | 3 | × | 5 |
| = | 6 | x | + | 15 |
| 6 | x | + | 15 | = | 2 | ( | 4 | x | + | 3 | ) | × | 13 |
| 方程右边 = | 26 | ( | 4 | x | + | 3 | ) |
| 6 | x | + | 15 | = | 26 | ( | 4 | x | + | 3 | ) |
| 方程右边 = | 26 | × | 4 | x | + | 26 | × | 3 |
| = | 104 | x | + | 78 |
| 6 | x | + | 15 | = | 104 | x | + | 78 |
| 6 | x | − | 104 | x | = | 78 | − | 15 |
| - | 98 | x | = | 78 | − | 15 |
| - | 98 | x | = | 63 |
| - | 63 | = | 98 | x |
| 98 | x | = | - | 63 |
| x | = | - | 63 | ÷ | 98 |
| = | - | 63 | × | 1 98 |
| = | - | 9 | × | 1 14 |
| x | = | - | 9 14 |
| x | = | - 0.642857 |