| ( | 10 | x | + | 1 | ) | ( | 10 | x | + | 1 | ) | ( | 10 | x | + | 1 | ) | ( | 10 | x | + | 1 | ) | ( | 10 | x | + | 1 | ) | − | ( | 40 | x | + | 1 | ) | ( | 40 | x | + | 1 | ) | = | 0 |
| Left side of the equation = | 10 | x | ( | 10 | x | + | 1 | ) | ( | 10 | x | + | 1 | ) | ( | 10 | x | + | 1 | ) | ( | 10 | x | + | 1 | ) | + | 1 | ( | 10 | x | + | 1 | ) | ( | 10 | x | + | 1 | ) | ( | 10 | x | + | 1 | ) | ( | 10 | x | + | 1 | ) | − | ( | 40 | x | + | 1 | ) |
| = | 10 | x | × | 10 | x | ( | 10 | x | + | 1 | ) | ( | 10 | x | + | 1 | ) | ( | 10 | x | + | 1 | ) | + | 10 | x | × | 1 | ( | 10 | x | + | 1 | ) | ( | 10 | x | + | 1 | ) |
| = | 100 | x | x | ( | 10 | x | + | 1 | ) | ( | 10 | x | + | 1 | ) | ( | 10 | x | + | 1 | ) | + | 10 | x | ( | 10 | x | + | 1 | ) | ( | 10 | x | + | 1 | ) | ( | 10 | x | + | 1 | ) | + | 1 |
| = | 100 | x | x | × | 10 | x | ( | 10 | x | + | 1 | ) | ( | 10 | x | + | 1 | ) | + | 100 | x | x | × | 1 | ( | 10 | x | + | 1 | ) |
| = | 1000 | x | x | x | ( | 10 | x | + | 1 | ) | ( | 10 | x | + | 1 | ) | + | 100 | x | x | ( | 10 | x | + | 1 | ) | ( | 10 | x | + | 1 | ) | + | 10 |
| = | 1000 | x | x | x | × | 10 | x | ( | 10 | x | + | 1 | ) | + | 1000 | x | x | x | × | 1 |
| = | 10000 | x | x | x | x | ( | 10 | x | + | 1 | ) | + | 1000 | x | x | x | ( | 10 | x | + | 1 | ) | + | 100 |
| = | 10000 | x | x | x | x | × | 10 | x | + | 10000 | x | x | x | x |
| = | 100000 | x | x | x | x | x | + | 10000 | x | x | x | x | + | 1000 |
| = | 100000 | x | x | x | x | x | + | 10000 | x | x | x | x | + | 1000 |
| = | 100000 | x | x | x | x | x | + | 10000 | x | x | x | x | + | 10000 |
| = | 100000 | x | x | x | x | x | + | 10000 | x | x | x | x | + | 10000 |
| = | 100000 | x | x | x | x | x | + | 10000 | x | x | x | x | + | 10000 |
| = | 100000 | x | x | x | x | x | + | 10000 | x | x | x | x | + | 10000 |
| = | 100000 | x | x | x | x | x | + | 10000 | x | x | x | x | + | 10000 |
| = | 100000 | x | x | x | x | x | + | 10000 | x | x | x | x | + | 10000 |
| = | 100000 | x | x | x | x | x | + | 10000 | x | x | x | x | + | 10000 |
| = | 100000 | x | x | x | x | x | + | 10000 | x | x | x | x | + | 10000 |
| = | 100000 | x | x | x | x | x | + | 10000 | x | x | x | x | + | 10000 |
| = | 100000 | x | x | x | x | x | + | 10000 | x | x | x | x | + | 10000 |
| = | 100000 | x | x | x | x | x | + | 10000 | x | x | x | x | + | 10000 |
| = | 100000 | x | x | x | x | x | + | 10000 | x | x | x | x | + | 10000 |
| = | 100000 | x | x | x | x | x | + | 10000 | x | x | x | x | + | 10000 |
| = | 100000 | x | x | x | x | x | + | 10000 | x | x | x | x | + | 10000 |
| = | 100000 | x | x | x | x | x | + | 10000 | x | x | x | x | + | 10000 |