| 5 | − | 4 | x | = | 1 | ÷ | ( | 5 | − | 4 | x | ) |
| Multiply both sides of the equation by: | ( | 5 | − | 4 | x | ) |
| 5 | ( | 5 | − | 4 | x | ) | − | 4 | x | ( | 5 | − | 4 | x | ) | = | 1 |
| 5 | × | 5 | − | 5 | × | 4 | x | − | 4 | x | ( | 5 | − | 4 | x | ) | = | 1 |
| 25 | − | 20 | x | − | 4 | x | ( | 5 | − | 4 | x | ) | = | 1 |
| 25 | − | 20 | x | − | 4 | x | × | 5 | + | 4 | x | × | 4 | x | = | 1 |
| 25 | − | 20 | x | − | 20 | x | + | 16 | x | x | = | 1 |
| 25 | − | 40 | x | + | 16 | x | x | = | 1 |
| x2= | 3 2 |