| 0 | = | 1000 | x | − | ( | ( | 350 | + | 150 | ) | x | + | 3600000 | ) |
| Right side of the equation = | 1000 | x | − | ( | 350 | + | 150 | ) | x | − | 3600000 |
| = | 1000 | x | − | 350 | x | − | 150 | x | − | 3600000 |
| = | 500 | x | − | 3600000 |
| 0 | = | 500 | x | − | 3600000 |
| - | 500 | x | = | - | 3600000 | − | 0 |
| - | 500 | x | = | - | 3600000 |
| 3600000 | = | 500 | x |
| 500 | x | = | 3600000 |
| x | = | 3600000 | ÷ | 500 |
| = | 3600000 | × | 1 500 |
| = | 7200 | × | 1 |
| x | = | 7200 |