| 5 | ( | x | ( | x | ( | x | ( | x | ( | 5 | x | + | 5 | ) | ) | ) | ) | ) | = | 1 |
| Left side of the equation = | 5 | x | ( | x | ( | x | ( | x | ( | 5 | x | + | 5 | ) | ) | ) | ) |
| = | 5 | x | x | ( | x | ( | x | ( | 5 | x | + | 5 | ) | ) | ) |
| = | 5 | x | x | x | ( | x | ( | 5 | x | + | 5 | ) | ) |
| = | 5 | x | x | x | x | ( | 5 | x | + | 5 | ) |
| = | 5 | x | x | x | x | × | 5 | x | + | 5 | x | x | x | x |
| = | 25 | x | x | x | x | x | + | 25 | x | x | x | x |
| 25 | x | x | x | x | x | + | 25 | x | x | x | x | = | 1 |