| 3000000000 | − | 1 | ÷ | 5 | × | x | = | x |
| Left side of the equation = | 3000000000 | − | 1 5 | x |
| 3000000000 | − | 1 5 | x | = | x |
| - | 1 5 | x | − | x | = | - | 3000000000 |
| - | 6 5 | x | = | - | 3000000000 |
| 3000000000 | = | 6 5 | x |
6 5 | x | = | 3000000000 |
| x | = | 3000000000 | ÷ | 6 5 |
| = | 3000000000 | × | 5 6 |
| = | 500000000 | × | 5 |
| x | = | 2500000000 |