| ( | x | + | 1 | ) | × | 3 | − | x | + | ( | x | − | 3 | ) | × | 3 | = | 0 |
| Left side of the equation = | x | × | 3 | + | 1 | × | 3 | − | x | + | ( | x | − | 3 | ) | × | 3 |
| = | x | × | 3 | + | 3 | − | x | + | ( | x | − | 3 | ) | × | 3 |
| = | 2 | x | + | 3 | + | ( | x | − | 3 | ) | × | 3 |
| = | 2 | x | + | 3 | + | x | × | 3 | − | 3 | × | 3 |
| = | 2 | x | + | 3 | + | x | × | 3 | − | 9 |
| = | 5 | x | − | 6 |
| 5 | x | − | 6 | = | 0 |
| 5 | x | = | 0 | + | 6 |
| 5 | x | = | 6 |
| x | = | 6 | ÷ | 5 |
| = | 6 | × | 1 5 |
| x | = | 6 5 |
| x | = | 1.2 |