11 10 | X | + | ( | X | + | 16 | ) | = | ( | 411 | − | 4 | ) |
| Left side of the equation = | 11 10 | X | + | X | + | 16 |
| = | 21 10 | X | + | 16 |
21 10 | X | + | 16 | = | ( | 411 | − | 4 | ) |
| Right side of the equation = | 411 | − | 4 |
| = | 407 |
21 10 | X | + | 16 | = | 407 |
21 10 | X | = | 407 | − | 16 |
21 10 | X | = | 391 |
| X | = | 391 | ÷ | 21 10 |
| = | 391 | × | 10 21 |
| X | = | 3910 21 |
| X | = | 186.190476 |