| ( | 25 4 | X | + | 18 | ) | ÷ | ( | 55 2 | X | ) | = | 22 | ÷ | 100 |
| Multiply both sides of the equation by: | ( | 55 2 | X | ) |
| ( | 25 4 | X | + | 18 | ) | = | 22 | ÷ | 100 | × | ( | 55 2 | X | ) |
25 4 | X | + | 18 | = | 22 | ÷ | 100 | × | ( | 55 2 | X | ) |
25 4 | X | + | 18 | = | 22 | ÷ | 100 | × | 55 2 | X |
25 4 | X | + | 18 | = | 121 20 | X |
25 4 | X | − | 121 20 | X | = | - | 18 |
1 5 | X | = | - | 18 |
| X | = | - | 18 | ÷ | 1 5 |
| = | - | 18 | × | 5 |
| X | = | - | 90 |