| ( | 2070 | + | X | ) | × | 3 100 | = | X |
| Left side of the equation = | 2070 | × | 3 100 | + | X | × | 3 100 |
| = | 621 10 | + | X | × | 3 100 |
621 10 | + | 3 100 | X | = | X |
3 100 | X | − | X | = | - | 621 10 |
| - | 97 100 | X | = | - | 621 10 |
621 10 | = | 97 100 | X |
97 100 | X | = | 621 10 |
| X | = | 621 10 | ÷ | 97 100 |
| = | 621 10 | × | 100 97 |
| = | 621 | × | 10 97 |
| X | = | 6210 97 |
| X | = | 64.020619 |