| 6 | x | × | 6 | + | ( | 6 | x | + | 16 | ) | × | 6 | = | 7 | x | × | 12 |
| Left side of the equation = | 36 | x | + | ( | 6 | x | + | 16 | ) | × | 6 |
| 36 | x | + | ( | 6 | x | + | 16 | ) | × | 6 | = | 7 | x | × | 12 |
| Left side of the equation = | 36 | x | + | 6 | x | × | 6 | + | 16 | × | 6 |
| = | 36 | x | + | 36 | x | + | 96 |
| = | 72 | x | + | 96 |
| 72 | x | + | 96 | = | 7 | x | × | 12 |
| Right side of the equation = | 84 | x |
| 72 | x | + | 96 | = | 84 | x |
| 72 | x | − | 84 | x | = | - | 96 |
| - | 12 | x | = | - | 96 |
| 96 | = | 12 | x |
| 12 | x | = | 96 |
| x | = | 96 | ÷ | 12 |
| = | 96 | × | 1 12 |
| = | 8 | × | 1 |
| x | = | 8 |