| 7 | ( | 12 | + | 557 20 | + | X | ) | = | 11522 25 |
| Left side of the equation = | 7 | × | 12 | + | 7 | × | 557 20 | + | 7 | X |
| = | 84 | + | 3899 20 | + | 7 | X |
| = | 5579 20 | + | 7 | X |
5579 20 | + | 7 | X | = | 11522 25 |
| 7 | X | = | 11522 25 | − | 5579 20 |
| 7 | X | = | 18193 100 |
| X | = | 18193 100 | ÷ | 7 |
| = | 18193 100 | × | 1 7 |
| = | 2599 100 | × | 1 |
| X | = | 2599 100 |
| X | = | 25.99 |