| 2 | k | − | 4 | ( | - | 1 4 | ) | = | 2 | ( | - | 1 4 | ) | + | 1 |
| Left side of the equation = | 2 | k | + | 4 | × | 1 4 |
| = | 2 | k | + | 1 |
| 2 | k | + | 1 | = | 2 | ( | - | 1 4 | ) | + | 1 |
| Right side of the equation = | - | 2 | × | 1 4 | + | 1 |
| = | - | 1 2 | + | 1 |
| = | 1 2 |
| 2 | k | + | 1 | = | 1 2 |
| 2 | k | = | 1 2 | − | 1 |
| 2 | k | = | - | 1 2 |
| k | = | - | 1 2 | ÷ | 2 |
| = | - | 1 2 | × | 1 2 |
| k | = | - | 1 4 |
| k | = | - 0.25 |