| 2 | ( | ( | 1 | ÷ | 10 | ) | + | ( | 2 | ÷ | 10 | ) | ) | + | 1 | ÷ | 10 | × | x | = | 1 |
| Left side of the equation = | 2 | ( | ( | 1 | ÷ | 10 | ) | + | ( | 2 | ÷ | 10 | ) | ) | + | 1 10 | x |
| 2 | ( | ( | 1 | ÷ | 10 | ) | + | ( | 2 | ÷ | 10 | ) | ) | + | 1 10 | x | = | 1 |
| Left side of the equation = | 2 | ( | 1 | ÷ | 10 | ) | + | 2 | ( | 2 | ÷ | 10 | ) | + | 1 10 | x |
| = | 2 | × | 1 | ÷ | 10 | + | 2 | ( | 2 | ÷ | 10 | ) | + | 1 10 | x |
| = | 1 5 | + | 2 | ( | 2 | ÷ | 10 | ) | + | 1 10 | x |
| = | 1 5 | + | 2 | × | 2 | ÷ | 10 | + | 1 10 | x |
| = | 1 5 | + | 2 5 | + | 1 10 | x |
| = | 3 5 | + | 1 10 | x |
3 5 | + | 1 10 | x | = | 1 |
1 10 | x | = | 1 | − | 3 5 |
1 10 | x | = | 2 5 |
| x | = | 2 5 | ÷ | 1 10 |
| = | 2 5 | × | 10 |
| = | 2 | × | 2 |
| x | = | 4 |