| 55 | x | = | 55 | × | 5 | + | 55 | ( | 55 | − | x | ) |
| Right side of the equation = | 275 | + | 55 | ( | 55 | − | x | ) |
| 55 | x | = | 275 | + | 55 | ( | 55 | − | x | ) |
| Right side of the equation = | 275 | + | 55 | × | 55 | − | 55 | x |
| = | 275 | + | 3025 | − | 55 | x |
| = | 3300 | − | 55 | x |
| 55 | x | = | 3300 | − | 55 | x |
| 55 | x | + | 55 | x | = | 3300 |
| 110 | x | = | 3300 |
| x | = | 3300 | ÷ | 110 |
| = | 3300 | × | 1 110 |
| = | 30 | × | 1 |
| x | = | 30 |