| 1 | ÷ | 6 | × | X | + | 1 | ÷ | 6 | × | X | + | 60 | = | 7 | ÷ | 15 | × | X |
| Left side of the equation = | 1 6 | X | + | 1 6 | X | + | 60 |
| = | 1 3 | X | + | 60 |
1 3 | X | + | 60 | = | 7 | ÷ | 15 | × | X |
| Right side of the equation = | 7 15 | X |
1 3 | X | + | 60 | = | 7 15 | X |
1 3 | X | − | 7 15 | X | = | - | 60 |
| - | 2 15 | X | = | - | 60 |
| 60 | = | 2 15 | X |
2 15 | X | = | 60 |
| X | = | 60 | ÷ | 2 15 |
| = | 60 | × | 15 2 |
| = | 30 | × | 15 |
| X | = | 450 |