| 5 | x | + | 16 | x | + | ( | 11 | − | 3 | x | ) | × | 11 | = | 116 |
| Left side of the equation = | 21 | x | + | ( | 11 | − | 3 | x | ) | × | 11 |
| 21 | x | + | ( | 11 | − | 3 | x | ) | × | 11 | = | 116 |
| Left side of the equation = | 21 | x | + | 11 | × | 11 | − | 3 | x | × | 11 |
| = | 21 | x | + | 121 | − | 33 | x |
| = | - | 12 | x | + | 121 |
| - | 12 | x | + | 121 | = | 116 |
| - | 12 | x | = | 116 | − | 121 |
| - | 12 | x | = | - | 5 |
| 5 | = | 12 | x |
| 12 | x | = | 5 |
| x | = | 5 | ÷ | 12 |
| = | 5 | × | 1 12 |
| x | = | 5 12 |
| x | = | 0.416667 |