12 500 | − | 5 200 | + | 12 500 | x | ( | - | 5 200 | ) | = | 0 |
| Left side of the equation = | - | 1 1000 | + | 12 500 | x | ( | - | 5 200 | ) |
| - | 1 1000 | + | 12 500 | x | ( | - | 5 200 | ) | = | 0 |
| Left side of the equation = | - | 1 1000 | − | 12 500 | x | × | 5 200 |
| = | - | 1 1000 | − | 3 5000 | x |
| - | 1 1000 | − | 3 5000 | x | = | 0 |
| - | 3 5000 | x | = | 0 | + | 1 1000 |
| - | 3 5000 | x | = | 1 1000 |
| - | 1 1000 | = | 3 5000 | x |
3 5000 | x | = | - | 1 1000 |
| x | = | - | 1 1000 | ÷ | 3 5000 |
| = | - | 1 1000 | × | 5000 3 |
| = | - | 1 | × | 5 3 |
| x | = | - | 5 3 |
| x | = | - 1.666667 |