| ( | x | − | 4 | ) | − | 5 | = | ( | 3 | x | − | 4 | ) | ÷ | 15 |
| x | − | 4 | − | 5 | = | ( | 3 | x | − | 4 | ) | ÷ | 15 |
| x | − | 4 | − | 5 | = | 3 | x | ÷ | 15 | − | 4 | ÷ | 15 |
| x | − | 4 | − | 5 | = | 1 5 | x | − | 4 15 |
| x | − | 9 | = | 1 5 | x | − | 4 15 |
| x | − | 1 5 | x | = | - | 4 15 | + | 9 |
4 5 | x | = | - | 4 15 | + | 9 |
4 5 | x | = | 131 15 |
| x | = | 131 15 | ÷ | 4 5 |
| = | 131 15 | × | 5 4 |
| = | 131 3 | × | 1 4 |
| x | = | 131 12 |
| x | = | 10.916667 |