| 2 | ( | 3 10 | + | 4 | ) | = | 5 | + | 5 | ( | 1 5 | x | − | 7 | ) |
| 方程左边 = | 2 | × | 3 10 | + | 2 | × | 4 |
| = | 3 5 | + | 8 |
| = | 43 5 |
43 5 | = | 5 | + | 5 | ( | 1 5 | x | − | 7 | ) |
| 方程右边 = | 5 | + | 5 | × | 1 5 | x | − | 5 | × | 7 |
| = | 5 | + | 1 | x | − | 35 |
| = | - | 30 | + | 1 | x |
43 5 | = | - | 30 | + | 1 | x |
| - | 1 | x | = | - | 30 | − | 43 5 |
| - | x | = | - | 30 | − | 43 5 |
| - | x | = | - | 193 5 |
193 5 | = | x |
| x | = | 193 5 |