| - | 2 5 | X | + | 1 10 | ( | 2500 | − | X | ) | = | 2480 |
| Left side of the equation = | - | 2 5 | X | + | 1 10 | × | 2500 | − | 1 10 | X |
| = | - | 2 5 | X | + | 250 | − | 1 10 | X |
| = | - | 1 2 | X | + | 250 |
| - | 1 2 | X | + | 250 | = | 2480 |
| - | 1 2 | X | = | 2480 | − | 250 |
| - | 1 2 | X | = | 2230 |
| - | 2230 | = | 1 2 | X |
1 2 | X | = | - | 2230 |
| X | = | - | 2230 | ÷ | 1 2 |
| = | - | 2230 | × | 2 |
| X | = | - | 4460 |