| 14 | x | + | 18 | ( | 5000 | − | x | ) | = | 18000 | + | 10 | x | + | 15 | ( | 5000 | − | x | ) |
| Left side of the equation = | 14 | x | + | 18 | × | 5000 | − | 18 | x |
| = | 14 | x | + | 90000 | − | 18 | x |
| = | - | 4 | x | + | 90000 |
| - | 4 | x | + | 90000 | = | 18000 | + | 10 | x | + | 15 | ( | 5000 | − | x | ) |
| Right side of the equation = | 18000 | + | 10 | x | + | 15 | × | 5000 | − | 15 | x |
| = | 18000 | + | 10 | x | + | 75000 | − | 15 | x |
| = | 93000 | − | 5 | x |
| - | 4 | x | + | 90000 | = | 93000 | − | 5 | x |
| - | 4 | x | + | 5 | x | = | 93000 | − | 90000 |
| x | = | 93000 | − | 90000 |
| x | = | 93000 | − | 90000 |
| x | = | 3000 |