| ( | 1 | ÷ | 60 | ) | ( | ( | 2 | ÷ | 3 | ) | x | ) | + | ( | 1 | ÷ | 20 | ) | ( | ( | 1 | ÷ | 3 | ) | x | ) | = | 1 2 |
| Left side of the equation = | 1 | ÷ | 60 | × | ( | ( | 2 | ÷ | 3 | ) | x | ) | + | ( | 1 | ÷ | 20 | ) | ( | ( | 1 | ÷ | 3 | ) | x | ) |
| = | 1 60 | ( | ( | 2 | ÷ | 3 | ) | x | ) | + | ( | 1 | ÷ | 20 | ) | ( | ( | 1 | ÷ | 3 | ) | x | ) |
| = | 1 60 | ( | 2 | ÷ | 3 | ) | x | + | ( | 1 | ÷ | 20 | ) | ( | ( | 1 | ÷ | 3 | ) | x | ) |
| = | 1 60 | × | 2 | ÷ | 3 | × | x | + | ( | 1 | ÷ | 20 | ) | ( | ( | 1 | ÷ | 3 | ) | x | ) |
| = | 1 90 | x | + | ( | 1 | ÷ | 20 | ) | ( | ( | 1 | ÷ | 3 | ) | x | ) |
| = | 1 90 | x | + | 1 | ÷ | 20 | × | ( | ( | 1 | ÷ | 3 | ) | x | ) |
| = | 1 90 | x | + | 1 20 | ( | ( | 1 | ÷ | 3 | ) | x | ) |
| = | 1 90 | x | + | 1 20 | ( | 1 | ÷ | 3 | ) | x |
| = | 1 90 | x | + | 1 20 | × | 1 | ÷ | 3 | × | x |
| = | 1 90 | x | + | 1 60 | x |
| = | 1 36 | x |
1 36 | x | = | 1 2 |
| x | = | 1 2 | ÷ | 1 36 |
| = | 1 2 | × | 36 |
| = | 1 | × | 18 |
| x | = | 18 |