| 5 | x | + | x | = | ( | x | + | 15 | + | x | ) | ÷ | 3 | × | 8 |
| Left side of the equation = | 6 | x |
| 6 | x | = | ( | x | + | 15 | + | x | ) | ÷ | 3 | × | 8 |
| Right side of the equation = | ( | x | + | 15 | + | x | ) | × | 8 3 |
| 6 | x | = | ( | x | + | 15 | + | x | ) | × | 8 3 |
| Right side of the equation = | x | × | 8 3 | + | 15 | × | 8 3 | + | x | × | 8 3 |
| = | x | × | 8 3 | + | 40 | + | x | × | 8 3 |
| = | 16 3 | x | + | 40 |
| 6 | x | = | 16 3 | x | + | 40 |
| 6 | x | − | 16 3 | x | = | 40 |
2 3 | x | = | 40 |
| x | = | 40 | ÷ | 2 3 |
| = | 40 | × | 3 2 |
| = | 20 | × | 3 |
| x | = | 60 |