| ( | x | − | 1 2 | ) | + | ( | x | − | 1 2 | ) | × | 9 10 | = | 210 |
| 方程左边 = | x | − | 1 2 | + | ( | x | − | 1 2 | ) | × | 9 10 |
| = | x | − | 1 2 | + | x | × | 9 10 | − | 1 2 | × | 9 10 |
| = | x | − | 1 2 | + | x | × | 9 10 | − | 9 20 |
| = | 19 10 | x | − | 19 20 |
19 10 | x | − | 19 20 | = | 210 |
19 10 | x | = | 210 | + | 19 20 |
19 10 | x | = | 4219 20 |
| x | = | 4219 20 | ÷ | 19 10 |
| = | 4219 20 | × | 10 19 |
| = | 4219 2 | × | 1 19 |
| x | = | 4219 38 |
| x | = | 111.026316 |