| 26 | + | ( | x | − | 18 | ) | × | 43 10 | + | 28 | = | 641 10 |
| Left side of the equation = | 54 | + | ( | x | − | 18 | ) | × | 43 10 |
| 54 | + | ( | x | − | 18 | ) | × | 43 10 | = | 641 10 |
| Left side of the equation = | 54 | + | x | × | 43 10 | − | 18 | × | 43 10 |
| = | 54 | + | x | × | 43 10 | − | 387 5 |
| = | - | 117 5 | + | 43 10 | x |
| - | 117 5 | + | 43 10 | x | = | 641 10 |
43 10 | x | = | 641 10 | + | 117 5 |
43 10 | x | = | 175 2 |
| x | = | 175 2 | ÷ | 43 10 |
| = | 175 2 | × | 10 43 |
| = | 175 | × | 5 43 |
| x | = | 875 43 |
| x | = | 20.348837 |