| ( | 6 | x | + | 23 | ) | = | 2 | ( | 1 | + | x | ) | ( | 4 | + | x | ) |
| Left side of the equation = | 6 | x | + | 23 |
| 6 | x | + | 23 | = | 2 | ( | 1 | + | x | ) | ( | 4 | + | x | ) |
| Right side of the equation = | 2 | × | 1 | ( | 4 | + | x | ) | + | 2 | x | ( | 4 | + | x | ) |
| = | 2 | ( | 4 | + | x | ) | + | 2 | x | ( | 4 | + | x | ) |
| = | 2 | × | 4 | + | 2 | x | + | 2 | x | ( | 4 | + | x | ) |
| = | 8 | + | 2 | x | + | 2 | x | ( | 4 | + | x | ) |
| = | 8 | + | 2 | x | + | 2 | x | × | 4 | + | 2 | x | x |
| = | 8 | + | 2 | x | + | 8 | x | + | 2 | x | x |
| = | 8 | + | 10 | x | + | 2 | x | x |
| 6 | x | + | 23 | = | 8 | + | 10 | x | + | 2 | x | x |