| x | − | ( | 1 | ÷ | 4 | × | x | + | 12 | − | ( | x | − | ( | 1 | ÷ | 4 | × | x | + | 12 | ) | ) | × | 3 | ÷ | 7 | ) | = | x | − | ( | 1 | ÷ | 4 | × | x | + | 12 | ) | − | ( | ( | x | − | 1 | ÷ | 4 | × | x | + | 12 | ) | × | 3 | ÷ | 7 | ) |
| 方程左边 = | x | − | 1 | ÷ | 4 | × | x | − | 12 | + | ( | x | − | ( | 1 | ÷ | 4 | × | x | + | 12 | ) | ) | × | 3 | ÷ | 7 |
| = | x | − | 1 4 | x | − | 12 | + | ( | x | − | ( | 1 | ÷ | 4 | × | x | + | 12 | ) | ) | × | 3 7 |
| = | 3 4 | x | − | 12 | + | ( | x | − | ( | 1 | ÷ | 4 | × | x | + | 12 | ) | ) | × | 3 7 |
| = | 3 4 | x | − | 12 | + | x | × | 3 7 | − | ( | 1 | ÷ | 4 | × | x | + | 12 | ) | × | 3 7 |
| = | 33 28 | x | − | 12 | − | ( | 1 | ÷ | 4 | × | x | + | 12 | ) | × | 3 7 |
| = | 33 28 | x | − | 12 | − | 1 | ÷ | 4 | × | x | × | 3 7 | − | 12 | × | 3 7 |
| = | 33 28 | x | − | 12 | − | 3 28 | x | − | 36 7 |
| = | 15 14 | x | − | 120 7 |
15 14 | x | − | 120 7 | = | x | − | ( | 1 | ÷ | 4 | × | x | + | 12 | ) | − | ( | ( | x | − | 1 | ÷ | 4 | × | x | + | 12 | ) | × | 3 | ÷ | 7 | ) |
| 方程右边 = | x | − | 1 | ÷ | 4 | × | x | − | 12 | − | ( | ( | x | − | 1 | ÷ | 4 | × | x | + | 12 | ) | × | 3 | ÷ | 7 | ) |
| = | x | − | 1 4 | x | − | 12 | − | ( | ( | x | − | 1 | ÷ | 4 | × | x | + | 12 | ) | × | 3 | ÷ | 7 | ) |
| = | 3 4 | x | − | 12 | − | ( | ( | x | − | 1 | ÷ | 4 | × | x | + | 12 | ) | × | 3 | ÷ | 7 | ) |
| = | 3 4 | x | − | 12 | − | ( | x | − | 1 | ÷ | 4 | × | x | + | 12 | ) | × | 3 | ÷ | 7 |
| = | 3 4 | x | − | 12 | − | ( | x | − | 1 | ÷ | 4 | × | x | + | 12 | ) | × | 3 7 |
| = | 3 4 | x | − | 12 | − | x | × | 3 7 | + | 1 | ÷ | 4 | × | x | × | 3 7 | − | 12 | × | 3 7 |
| = | 3 4 | x | − | 12 | − | x | × | 3 7 | + | 3 28 | x | − | 36 7 |
| = | 3 7 | x | − | 120 7 |
15 14 | x | − | 120 7 | = | 3 7 | x | − | 120 7 |
15 14 | x | − | 3 7 | x | = | - | 120 7 | + | 120 7 |
9 14 | x | = | - | 120 7 | + | 120 7 |
9 14 | x | = | - | 0 |
| x | = | - | 0 | ÷ | 9 14 |
| = | - | 0 | × | 14 9 |
| = | - | 0 | × | 2 9 |
| x | = | 0 |