| 170985 | = | 6000 | x | + | ( | 30 | − | x | ) | × | 5400 |
| Right side of the equation = | 6000 | x | + | 30 | × | 5400 | − | x | × | 5400 |
| = | 6000 | x | + | 162000 | − | x | × | 5400 |
| = | 600 | x | + | 162000 |
| 170985 | = | 600 | x | + | 162000 |
| - | 600 | x | = | 162000 | − | 170985 |
| - | 600 | x | = | - | 8985 |
| 8985 | = | 600 | x |
| 600 | x | = | 8985 |
| x | = | 8985 | ÷ | 600 |
| = | 8985 | × | 1 600 |
| = | 599 | × | 1 40 |
| x | = | 599 40 |
| x | = | 14.975 |