| 1120 | = | 10000 | ( | 18000 | − | x | ) | − | 5000 |
| Right side of the equation = | 10000 | × | 18000 | − | 10000 | x | − | 5000 |
| = | 180000000 | − | 10000 | x | − | 5000 |
| = | 179995000 | − | 10000 | x |
| 1120 | = | 179995000 | − | 10000 | x |
| 10000 | x | = | 179995000 | − | 1120 |
| 10000 | x | = | 179993880 |
| x | = | 179993880 | ÷ | 10000 |
| = | 179993880 | × | 1 10000 |
| = | 4499847 | × | 1 250 |
| x | = | 4499847 250 |
| x | = | 17999.388 |