| ( | 5 | ( | 12 | + | X | ) | + | 4 | + | 3 | + | 2 | + | 3 | ) | ÷ | ( | 18 | + | X | ) | = | 23 5 |
| Multiply both sides of the equation by: | ( | 18 | + | X | ) |
| ( | 5 | ( | 12 | + | X | ) | + | 4 | + | 3 | + | 2 | + | 3 | ) | = | 23 5 | ( | 18 | + | X | ) |
| 5 | ( | 12 | + | X | ) | + | 4 | + | 3 | + | 2 | + | 3 | = | 23 5 | ( | 18 | + | X | ) |
| 5 | ( | 12 | + | X | ) | + | 4 | + | 3 | + | 2 | + | 3 | = | 23 5 | × | 18 | + | 23 5 | X |
| 5 | ( | 12 | + | X | ) | + | 4 | + | 3 | + | 2 | + | 3 | = | 414 5 | + | 23 5 | X |
| 5 | ( | 12 | + | X | ) | + | 12 | = | 414 5 | + | 23 5 | X |
| 5 | × | 12 | + | 5 | X | + | 12 | = | 414 5 | + | 23 5 | X |
| 60 | + | 5 | X | + | 12 | = | 414 5 | + | 23 5 | X |
| 72 | + | 5 | X | = | 414 5 | + | 23 5 | X |
| 5 | X | − | 23 5 | X | = | 414 5 | − | 72 |
2 5 | X | = | 414 5 | − | 72 |
2 5 | X | = | 54 5 |
| X | = | 54 5 | ÷ | 2 5 |
| = | 54 5 | × | 5 2 |
| = | 27 | × | 1 |
| X | = | 27 |