| 5 | ( | 1 | ÷ | 4 | × | ( | 3 | ( | 2 | x | − | 1 | ) | − | 1 | ) | − | 1 | ) | = | 4 |
| 方程左边 = | 5 | × | 1 | ÷ | 4 | × | ( | 3 | ( | 2 | x | − | 1 | ) | − | 1 | ) | − | 5 | × | 1 |
| = | 5 4 | ( | 3 | ( | 2 | x | − | 1 | ) | − | 1 | ) | − | 5 |
| = | 5 4 | × | 3 | ( | 2 | x | − | 1 | ) | − | 5 4 | × | 1 | − | 5 |
| = | 15 4 | ( | 2 | x | − | 1 | ) | − | 5 4 | − | 5 |
| = | 15 4 | ( | 2 | x | − | 1 | ) | − | 25 4 |
| = | 15 4 | × | 2 | x | − | 15 4 | × | 1 | − | 25 4 |
| = | 15 2 | x | − | 15 4 | − | 25 4 |
| = | 15 2 | x | − | 10 |
15 2 | x | − | 10 | = | 4 |
15 2 | x | = | 4 | + | 10 |
15 2 | x | = | 14 |
| x | = | 14 | ÷ | 15 2 |
| = | 14 | × | 2 15 |
| x | = | 28 15 |
| x | = | 1.866667 |