| ( | 4 | − | 8 | x | ) | ( | 1 | + | 3 | x | ) | = | 4 |
| Left side of the equation = | 4 | ( | 1 | + | 3 | x | ) | − | 8 | x | ( | 1 | + | 3 | x | ) |
| = | 4 | × | 1 | + | 4 | × | 3 | x | − | 8 | x | ( | 1 | + | 3 | x | ) |
| = | 4 | + | 12 | x | − | 8 | x | ( | 1 | + | 3 | x | ) |
| = | 4 | + | 12 | x | − | 8 | x | × | 1 | − | 8 | x | × | 3 | x |
| = | 4 | + | 12 | x | − | 8 | x | − | 24 | x | x |
| = | 4 | + | 4 | x | − | 24 | x | x |
| 4 | + | 4 | x | − | 24 | x | x | = | 4 |
| x2= | 1 6 |