| 10000 | X | − | 10000 | X | × | 5 100 | − | 2850000 | = | 71250 |
| Left side of the equation = | 10000 | X | − | 500 | X | − | 2850000 |
| = | 9500 | X | − | 2850000 |
| 9500 | X | − | 2850000 | = | 71250 |
| 9500 | X | = | 71250 | + | 2850000 |
| 9500 | X | = | 2921250 |
| X | = | 2921250 | ÷ | 9500 |
| = | 2921250 | × | 1 9500 |
| = | 615 | × | 1 2 |
| X | = | 615 2 |
| X | = | 307.5 |