| - | 1 | ÷ | 12 | × | ( | X | − | 4 | ) | ( | X | − | 4 | ) | + | 3 | = | 63 25 |
| 方程左边 = | - | 1 12 | ( | X | − | 4 | ) | ( | X | − | 4 | ) | + | 3 |
| - | 1 12 | ( | X | − | 4 | ) | ( | X | − | 4 | ) | + | 3 | = | 63 25 |
| 方程左边 = | - | 1 12 | X | ( | X | − | 4 | ) | + | 1 12 | × | 4 | ( | X | − | 4 | ) | + | 3 |
| = | - | 1 12 | X | ( | X | − | 4 | ) | + | 1 3 | ( | X | − | 4 | ) | + | 3 |
| = | - | 1 12 | X | X | + | 1 12 | X | × | 4 | + | 1 3 | ( | X | − | 4 | ) | + | 3 |
| = | - | 1 12 | X | X | + | 1 3 | X | + | 1 3 | ( | X | − | 4 | ) | + | 3 |
| = | - | 1 12 | X | X | + | 1 3 | X | + | 1 3 | X | − | 1 3 | × | 4 | + | 3 |
| = | - | 1 12 | X | X | + | 1 3 | X | + | 1 3 | X | − | 4 3 | + | 3 |
| = | - | 1 12 | X | X | + | 2 3 | X | + | 5 3 |
| - | 1 12 | X | X | + | 2 3 | X | + | 5 3 | = | 63 25 |
| X1= | 8 5 |
| X2= | 32 5 |