| 6 | ( | 2 | ( | 7 | ( | x | + | 7 | ) | + | 6 | ) | − | 14 | ) | + | 3 | = | 75 |
| 方程左边 = | 6 | × | 2 | ( | 7 | ( | x | + | 7 | ) | + | 6 | ) | − | 6 | × | 14 | + | 3 |
| = | 12 | ( | 7 | ( | x | + | 7 | ) | + | 6 | ) | − | 84 | + | 3 |
| = | 12 | ( | 7 | ( | x | + | 7 | ) | + | 6 | ) | − | 81 |
| = | 12 | × | 7 | ( | x | + | 7 | ) | + | 12 | × | 6 | − | 81 |
| = | 84 | ( | x | + | 7 | ) | + | 72 | − | 81 |
| = | 84 | ( | x | + | 7 | ) | − | 9 |
| = | 84 | x | + | 84 | × | 7 | − | 9 |
| = | 84 | x | + | 588 | − | 9 |
| = | 84 | x | + | 579 |
| 84 | x | + | 579 | = | 75 |
| 84 | x | = | 75 | − | 579 |
| 84 | x | = | - | 504 |
| x | = | - | 504 | ÷ | 84 |
| = | - | 504 | × | 1 84 |
| = | - | 6 | × | 1 |
| x | = | - | 6 |