| 5 | ÷ | 12 | × | c | = | 3 | ÷ | 4 | × | ( | 2 | ÷ | 3 | × | c | − | 4 | ) |
| 方程左边 = | 5 12 | c |
5 12 | c | = | 3 | ÷ | 4 | × | ( | 2 | ÷ | 3 | × | c | − | 4 | ) |
| 方程右边 = | 3 4 | ( | 2 | ÷ | 3 | × | c | − | 4 | ) |
5 12 | c | = | 3 4 | ( | 2 | ÷ | 3 | × | c | − | 4 | ) |
| 方程右边 = | 3 4 | × | 2 | ÷ | 3 | × | c | − | 3 4 | × | 4 |
| = | 1 2 | c | − | 3 |
5 12 | c | = | 1 2 | c | − | 3 |
5 12 | c | − | 1 2 | c | = | - | 3 |
| - | 1 12 | c | = | - | 3 |
| 3 | = | 1 12 | c |
1 12 | c | = | 3 |
| c | = | 3 | ÷ | 1 12 |
| = | 3 | × | 12 |
| c | = | 36 |