| 6 | ( | 12 | + | x | ) | = | 10 | ( | 12 | − | x | ) |
| Left side of the equation = | 6 | × | 12 | + | 6 | x |
| = | 72 | + | 6 | x |
| 72 | + | 6 | x | = | 10 | ( | 12 | − | x | ) |
| Right side of the equation = | 10 | × | 12 | − | 10 | x |
| = | 120 | − | 10 | x |
| 72 | + | 6 | x | = | 120 | − | 10 | x |
| 6 | x | + | 10 | x | = | 120 | − | 72 |
| 16 | x | = | 120 | − | 72 |
| 16 | x | = | 48 |
| x | = | 48 | ÷ | 16 |
| = | 48 | × | 1 16 |
| = | 3 | × | 1 |
| x | = | 3 |