| 1 | ÷ | 60 | × | 20 | + | ( | 1 | ÷ | 60 | + | 1 | ÷ | 90 | ) | x | = | 1 |
| Left side of the equation = | 1 3 | + | ( | 1 | ÷ | 60 | + | 1 | ÷ | 90 | ) | x |
1 3 | + | ( | 1 | ÷ | 60 | + | 1 | ÷ | 90 | ) | x | = | 1 |
| Left side of the equation = | 1 3 | + | 1 | ÷ | 60 | × | x | + | 1 | ÷ | 90 | × | x |
| = | 1 3 | + | 1 60 | x | + | 1 90 | x |
| = | 1 3 | + | 1 36 | x |
1 3 | + | 1 36 | x | = | 1 |
1 36 | x | = | 1 | − | 1 3 |
1 36 | x | = | 2 3 |
| x | = | 2 3 | ÷ | 1 36 |
| = | 2 3 | × | 36 |
| = | 2 | × | 12 |
| x | = | 24 |