| 50 | + | ( | x | − | 50 | ) | × | 11 20 | = | 0 |
| Left side of the equation = | 50 | + | x | × | 11 20 | − | 50 | × | 11 20 |
| = | 50 | + | x | × | 11 20 | − | 55 2 |
| = | 45 2 | + | 11 20 | x |
45 2 | + | 11 20 | x | = | 0 |
11 20 | x | = | 0 | − | 45 2 |
11 20 | x | = | - | 45 2 |
| x | = | - | 45 2 | ÷ | 11 20 |
| = | - | 45 2 | × | 20 11 |
| = | - | 45 | × | 10 11 |
| x | = | - | 450 11 |
| x | = | - 40.909091 |