| 80 | ( | X | + | 10 | ÷ | 60 | ) | = | 100 | X | + | 10 |
| Left side of the equation = | 80 | X | + | 80 | × | 10 | ÷ | 60 |
| = | 80 | X | + | 40 3 |
| 80 | X | + | 40 3 | = | 100 | X | + | 10 |
| 80 | X | − | 100 | X | = | 10 | − | 40 3 |
| - | 20 | X | = | 10 | − | 40 3 |
| - | 20 | X | = | - | 10 3 |
10 3 | = | 20 | X |
| 20 | X | = | 10 3 |
| X | = | 10 3 | ÷ | 20 |
| = | 10 3 | × | 1 20 |
| = | 1 3 | × | 1 2 |
| X | = | 1 6 |
| X | = | 0.166667 |