| ( | 2142 | + | X | ) | × | 3 100 | = | X |
| Left side of the equation = | 2142 | × | 3 100 | + | X | × | 3 100 |
| = | 3213 50 | + | X | × | 3 100 |
3213 50 | + | 3 100 | X | = | X |
3 100 | X | − | X | = | - | 3213 50 |
| - | 97 100 | X | = | - | 3213 50 |
3213 50 | = | 97 100 | X |
97 100 | X | = | 3213 50 |
| X | = | 3213 50 | ÷ | 97 100 |
| = | 3213 50 | × | 100 97 |
| = | 3213 | × | 2 97 |
| X | = | 6426 97 |
| X | = | 66.247423 |