| ( | 5518 | + | 10 | x | ) | ÷ | ( | 620 | + | x | ) | = | 9 |
| Multiply both sides of the equation by: | ( | 620 | + | x | ) |
| ( | 5518 | + | 10 | x | ) | = | 9 | ( | 620 | + | x | ) |
| 5518 | + | 10 | x | = | 9 | ( | 620 | + | x | ) |
| 5518 | + | 10 | x | = | 9 | × | 620 | + | 9 | x |
| 5518 | + | 10 | x | = | 5580 | + | 9 | x |
| 10 | x | − | 9 | x | = | 5580 | − | 5518 |
| x | = | 5580 | − | 5518 |
| x | = | 5580 | − | 5518 |
| x | = | 62 |