| 80 | ( | X | + | 10 | ÷ | 60 | ) | + | 10 | = | 100 | X |
| Left side of the equation = | 80 | X | + | 80 | × | 10 | ÷ | 60 | + | 10 |
| = | 80 | X | + | 40 3 | + | 10 |
| = | 80 | X | + | 70 3 |
| 80 | X | + | 70 3 | = | 100 | X |
| 80 | X | − | 100 | X | = | - | 70 3 |
| - | 20 | X | = | - | 70 3 |
70 3 | = | 20 | X |
| 20 | X | = | 70 3 |
| X | = | 70 3 | ÷ | 20 |
| = | 70 3 | × | 1 20 |
| = | 7 3 | × | 1 2 |
| X | = | 7 6 |
| X | = | 1.166667 |