| ( | 1 | ÷ | 6 | × | x | ) | + | 4 | = | 2 | ÷ | 3 | × | ( | 21 | − | x | ) |
| 方程左边 = | 1 | ÷ | 6 | × | x | + | 4 |
| = | 1 6 | x | + | 4 |
1 6 | x | + | 4 | = | 2 | ÷ | 3 | × | ( | 21 | − | x | ) |
| 方程右边 = | 2 3 | ( | 21 | − | x | ) |
1 6 | x | + | 4 | = | 2 3 | ( | 21 | − | x | ) |
| 方程右边 = | 2 3 | × | 21 | − | 2 3 | x |
| = | 14 | − | 2 3 | x |
1 6 | x | + | 4 | = | 14 | − | 2 3 | x |
1 6 | x | + | 2 3 | x | = | 14 | − | 4 |
5 6 | x | = | 14 | − | 4 |
5 6 | x | = | 10 |
| x | = | 10 | ÷ | 5 6 |
| = | 10 | × | 6 5 |
| = | 2 | × | 6 |
| x | = | 12 |