| ( | X | + | 50 100 | X | ) | × | 90 100 | + | 50 | = | 370 |
| Left side of the equation = | X | × | 90 100 | + | 50 100 | X | × | 90 100 | + | 50 |
| = | X | × | 90 100 | + | 9 20 | X | + | 50 |
| = | 27 20 | X | + | 50 |
27 20 | X | + | 50 | = | 370 |
27 20 | X | = | 370 | − | 50 |
27 20 | X | = | 320 |
| X | = | 320 | ÷ | 27 20 |
| = | 320 | × | 20 27 |
| X | = | 6400 27 |
| X | = | 237.037037 |