| 1000 | x | ÷ | ( | 1000 | + | 128000 | × | 1 2 | ) | = | 4 5 |
| Multiply both sides of the equation by: | ( | 1000 | + | 128000 | × | 1 2 | ) |
| 1000 | x | = | 4 5 | ( | 1000 | + | 128000 | × | 1 2 | ) |
| 1000 | x | = | 4 5 | × | 1000 | + | 4 5 | × | 128000 | × | 1 2 |
| 1000 | x | = | 800 | + | 51200 |
| 1000 | x | = | 52000 |
| x | = | 52000 | ÷ | 1000 |
| = | 52000 | × | 1 1000 |
| = | 52 | × | 1 |
| x | = | 52 |