| ( | 249 5 | + | 11 10 | ) | ÷ | x | = | 21 10 |
| Multiply both sides of the equation by: | x |
| ( | 249 5 | + | 11 10 | ) | = | 21 10 | x |
249 5 | + | 11 10 | = | 21 10 | x |
509 10 | = | 21 10 | x |
| - | 21 10 | x | = | - | 509 10 |
509 10 | = | 21 10 | x |
21 10 | x | = | 509 10 |
| x | = | 509 10 | ÷ | 21 10 |
| = | 509 10 | × | 10 21 |
| = | 509 | × | 1 21 |
| x | = | 509 21 |
| x | = | 24.238095 |