| 12 | ( | 2 | − | 3 | x | ) | − | 17 5 | = | 4 | x | + | 4 |
| Left side of the equation = | 12 | × | 2 | − | 12 | × | 3 | x | − | 17 5 |
| = | 24 | − | 36 | x | − | 17 5 |
| = | 103 5 | − | 36 | x |
103 5 | − | 36 | x | = | 4 | x | + | 4 |
| - | 36 | x | − | 4 | x | = | 4 | − | 103 5 |
| - | 40 | x | = | 4 | − | 103 5 |
| - | 40 | x | = | - | 83 5 |
83 5 | = | 40 | x |
| 40 | x | = | 83 5 |
| x | = | 83 5 | ÷ | 40 |
| = | 83 5 | × | 1 40 |
| x | = | 83 200 |
| x | = | 0.415 |