| x | ÷ | 5200 | − | x | ÷ | 4000 | = | - | 1 2 | + | 123 500 |
| Left side of the equation = | - | 3 52000 | x |
| - | 3 52000 | x | = | - | 1 2 | + | 123 500 |
| Right side of the equation = | - | 127 500 |
| - | 3 52000 | x | = | - | 127 500 |
127 500 | = | 3 52000 | x |
3 52000 | x | = | 127 500 |
| x | = | 127 500 | ÷ | 3 52000 |
| = | 127 500 | × | 52000 3 |
| = | 127 | × | 104 3 |
| x | = | 13208 3 |
| x | = | 4402.666667 |