| 60 | × | 12 5 | + | ( | x | − | 60 | ) | × | 18 5 | = | 66 25 | x |
| Left side of the equation = | 144 | + | ( | x | − | 60 | ) | × | 18 5 |
| 144 | + | ( | x | − | 60 | ) | × | 18 5 | = | 66 25 | x |
| Left side of the equation = | 144 | + | x | × | 18 5 | − | 60 | × | 18 5 |
| = | 144 | + | x | × | 18 5 | − | 216 |
| = | - | 72 | + | 18 5 | x |
| - | 72 | + | 18 5 | x | = | 66 25 | x |
18 5 | x | − | 66 25 | x | = | 72 |
24 25 | x | = | 72 |
| x | = | 72 | ÷ | 24 25 |
| = | 72 | × | 25 24 |
| = | 3 | × | 25 |
| x | = | 75 |