| x | ( | x | + | 1 | ) | ( | 1 | + | 1 2 | x | ) | + | 10 | = | 0 |
| Left side of the equation = | x | x | ( | 1 | + | 1 2 | x | ) | + | x | × | 1 | ( | 1 | + | 1 2 | x | ) | + | 10 |
| = | x | x | × | 1 | + | x | x | × | 1 2 | x | + | x | × | 1 | ( | 1 | + | 1 2 | x | ) | + | 10 |
| = | x | x | × | 1 | + | x | x | × | 1 2 | x | + | x | × | 1 | × | 1 | + | x | × | 1 |
| = | x | x | × | 1 | + | x | x | × | 1 2 | x | + | x | × | 1 | + | x | × | 1 2 | x |
| x | x | × | 1 | + | x | x | × | 1 2 | x | + | 1 | x | + | x | × | 1 2 | x | = | 0 |