12 5 | x | − | 3 | x | + | 102 5 | = | 3 | + | 2 | x |
| Left side of the equation = | - | 3 5 | x | + | 102 5 |
| - | 3 5 | x | + | 102 5 | = | 3 | + | 2 | x |
| - | 3 5 | x | − | 2 | x | = | 3 | − | 102 5 |
| - | 13 5 | x | = | 3 | − | 102 5 |
| - | 13 5 | x | = | - | 87 5 |
87 5 | = | 13 5 | x |
13 5 | x | = | 87 5 |
| x | = | 87 5 | ÷ | 13 5 |
| = | 87 5 | × | 5 13 |
| = | 87 | × | 1 13 |
| x | = | 87 13 |
| x | = | 6.692308 |