| 12 | ÷ | x | = | 12 | ÷ | ( | 4 | + | x | ) | + | 4 |
| Multiply both sides of the equation by: | x | , | ( | 4 | + | x | ) |
| 12 | ( | 4 | + | x | ) | = | 12 | x | + | 4 | x | ( | 4 | + | x | ) |
| 12 | × | 4 | + | 12 | x | = | 12 | x | + | 4 | x | ( | 4 | + | x | ) |
| 12 | × | 4 | + | 12 | x | = | 12 | x | + | 4 | x | × | 4 | + | 4 | x | x |
| 48 | + | 12 | x | = | 12 | x | + | 16 | x | + | 4 | x | x |
| 48 | + | 12 | x | = | 28 | x | + | 4 | x | x |