| ( | X | − | 1860 | − | 5000 | ) | × | 1 10 | − | 210 | = | X | − | 12000 | − | 210 |
| Left side of the equation = | X | × | 1 10 | − | 1860 | × | 1 10 | − | 5000 | × | 1 10 | − | 210 |
| = | X | × | 1 10 | − | 186 | − | 500 | − | 210 |
| = | 1 10 | X | − | 896 |
1 10 | X | − | 896 | = | X | − | 12000 | − | 210 |
| Right side of the equation = | X | − | 12210 |
1 10 | X | − | 896 | = | X | − | 12210 |
1 10 | X | − | X | = | - | 12210 | + | 896 |
| - | 9 10 | X | = | - | 12210 | + | 896 |
| - | 9 10 | X | = | - | 11314 |
| 11314 | = | 9 10 | X |
9 10 | X | = | 11314 |
| X | = | 11314 | ÷ | 9 10 |
| = | 11314 | × | 10 9 |
| X | = | 113140 9 |
| X | = | 12571.111111 |