| X | = | ( | X | − | 405000 | ) | ÷ | 7 10 |
| Right side of the equation = | X | × | 10 7 | − | 405000 | × | 10 7 |
| = | X | × | 10 7 | − | 4050000 7 |
| X | = | 10 7 | X | − | 4050000 7 |
| X | − | 10 7 | X | = | - | 4050000 7 |
| - | 3 7 | X | = | - | 4050000 7 |
4050000 7 | = | 3 7 | X |
3 7 | X | = | 4050000 7 |
| X | = | 4050000 7 | ÷ | 3 7 |
| = | 4050000 7 | × | 7 3 |
| = | 1350000 | × | 1 |
| X | = | 1350000 |