| 10000 | ( | 36 | − | x | ) | = | 3200 | × | 25 | x |
| Left side of the equation = | 10000 | × | 36 | − | 10000 | x |
| = | 360000 | − | 10000 | x |
| 360000 | − | 10000 | x | = | 3200 | × | 25 | x |
| Right side of the equation = | 80000 | x |
| 360000 | − | 10000 | x | = | 80000 | x |
| - | 10000 | x | − | 80000 | x | = | - | 360000 |
| - | 90000 | x | = | - | 360000 |
| 360000 | = | 90000 | x |
| 90000 | x | = | 360000 |
| x | = | 360000 | ÷ | 90000 |
| = | 360000 | × | 1 90000 |
| = | 4 | × | 1 |
| x | = | 4 |