| 5 | ( | 4 | + | x | ) | + | 12 | + | 2 | = | 43 10 | ( | 9 | + | x | ) |
| 方程左边 = | 5 | ( | 4 | + | x | ) | + | 14 |
| 5 | ( | 4 | + | x | ) | + | 14 | = | 43 10 | ( | 9 | + | x | ) |
| 方程左边 = | 5 | × | 4 | + | 5 | x | + | 14 |
| = | 20 | + | 5 | x | + | 14 |
| = | 34 | + | 5 | x |
| 34 | + | 5 | x | = | 43 10 | ( | 9 | + | x | ) |
| 方程右边 = | 43 10 | × | 9 | + | 43 10 | x |
| = | 387 10 | + | 43 10 | x |
| 34 | + | 5 | x | = | 387 10 | + | 43 10 | x |
| 5 | x | − | 43 10 | x | = | 387 10 | − | 34 |
7 10 | x | = | 387 10 | − | 34 |
7 10 | x | = | 47 10 |
| x | = | 47 10 | ÷ | 7 10 |
| = | 47 10 | × | 10 7 |
| = | 47 | × | 1 7 |
| x | = | 47 7 |
| x | = | 6.714286 |