| ( | X | + | 504 25 | ) | ÷ | ( | X | + | 504 25 | + | 21432 | ) | = | 3 20 |
| Multiply both sides of the equation by: | ( | X | + | 504 25 | + | 21432 | ) |
| ( | X | + | 504 25 | ) | = | 3 20 | ( | X | + | 504 25 | + | 21432 | ) |
| X | + | 504 25 | = | 3 20 | ( | X | + | 504 25 | + | 21432 | ) |
| X | + | 504 25 | = | 3 20 | X | + | 3 20 | × | 504 25 | + | 3 20 | × | 21432 |
| X | + | 504 25 | = | 3 20 | X | + | 378 125 | + | 16074 5 |
| X | + | 504 25 | = | 3 20 | X | + | 402228 125 |
| X | − | 3 20 | X | = | 402228 125 | − | 504 25 |
17 20 | X | = | 402228 125 | − | 504 25 |
17 20 | X | = | 399708 125 |
| X | = | 399708 125 | ÷ | 17 20 |
| = | 399708 125 | × | 20 17 |
| = | 399708 25 | × | 4 17 |
| X | = | 1598832 425 |
| X | = | 3761.957647 |