| ( | X | − | 211 125 | ) | × | 200 | − | 1 10 | = | 4 5 |
| Left side of the equation = | X | × | 200 | − | 211 125 | × | 200 | − | 1 10 |
| = | X | × | 200 | − | 1688 5 | − | 1 10 |
| = | 200 | X | − | 3377 10 |
| 200 | X | − | 3377 10 | = | 4 5 |
| 200 | X | = | 4 5 | + | 3377 10 |
| 200 | X | = | 677 2 |
| X | = | 677 2 | ÷ | 200 |
| = | 677 2 | × | 1 200 |
| X | = | 677 400 |
| X | = | 1.6925 |