| 343 | + | X | ÷ | ( | 266 | + | X | ) | = | 19 20 |
| Multiply both sides of the equation by: | ( | 266 | + | X | ) |
| 343 | ( | 266 | + | X | ) | + | X | = | 19 20 | ( | 266 | + | X | ) |
| 343 | × | 266 | + | 343 | X | + | X | = | 19 20 | ( | 266 | + | X | ) |
| 343 | × | 266 | + | 343 | X | + | X | = | 19 20 | × | 266 | + | 19 20 | X |
| 91238 | + | 343 | X | + | X | = | 2527 10 | + | 19 20 | X |
| 91238 | + | 344 | X | = | 2527 10 | + | 19 20 | X |
| 344 | X | − | 19 20 | X | = | 2527 10 | − | 91238 |
6861 20 | X | = | 2527 10 | − | 91238 |
6861 20 | X | = | - | 909853 10 |
| X | = | - | 909853 10 | ÷ | 6861 20 |
| = | - | 909853 10 | × | 20 6861 |
| = | - | 909853 | × | 2 6861 |
| X | = | - | 1819706 6861 |
| X | = | - 265.224603 |