| ( | X | × | 60 100 | × | 4 | + | 1240 | × | 10 | ) | = | 11 2 | X |
| Left side of the equation = | X | × | 60 100 | × | 4 | + | 1240 | × | 10 |
| = | X | × | 12 5 | + | 12400 |
12 5 | X | + | 12400 | = | 11 2 | X |
12 5 | X | − | 11 2 | X | = | - | 12400 |
| - | 31 10 | X | = | - | 12400 |
| 12400 | = | 31 10 | X |
31 10 | X | = | 12400 |
| X | = | 12400 | ÷ | 31 10 |
| = | 12400 | × | 10 31 |
| = | 400 | × | 10 |
| X | = | 4000 |