| ( | 64 | + | X | ) | ÷ | ( | 4 | + | X | ) | = | 3 |
| Multiply both sides of the equation by: | ( | 4 | + | X | ) |
| ( | 64 | + | X | ) | = | 3 | ( | 4 | + | X | ) |
| 64 | + | X | = | 3 | ( | 4 | + | X | ) |
| 64 | + | X | = | 3 | × | 4 | + | 3 | X |
| 64 | + | X | = | 12 | + | 3 | X |
| X | − | 3 | X | = | 12 | − | 64 |
| - | 2 | X | = | 12 | − | 64 |
| - | 2 | X | = | - | 52 |
| 52 | = | 2 | X |
| 2 | X | = | 52 |
| X | = | 52 | ÷ | 2 |
| = | 52 | × | 1 2 |
| = | 26 | × | 1 |
| X | = | 26 |