| - | 12500 | − | ( | 50000 | + | X | ) | × | 1 100 | + | X | = | 50000 |
| Left side of the equation = | - | 12500 | − | 50000 | × | 1 100 | − | X | × | 1 100 | + | X |
| = | - | 12500 | − | 500 | − | X | × | 1 100 | + | X |
| = | - | 13000 | + | 99 100 | X |
| - | 13000 | + | 99 100 | X | = | 50000 |
99 100 | X | = | 50000 | + | 13000 |
99 100 | X | = | 63000 |
| X | = | 63000 | ÷ | 99 100 |
| = | 63000 | × | 100 99 |
| = | 7000 | × | 100 11 |
| X | = | 700000 11 |
| X | = | 63636.363636 |