| x | × | 4033 10 | + | ( | 13 2 | − | x | ) | × | 4243 10 | = | 2179 10 | × | 13 2 | + | 122863 200 | + | 315273 1000 |
| 方程左边 = | 4033 10 | x | + | 13 2 | × | 4243 10 | − | x | × | 4243 10 |
| = | 4033 10 | x | + | 55159 20 | − | x | × | 4243 10 |
| = | - | 21 | x | + | 55159 20 |
| - | 21 | x | + | 55159 20 | = | 2179 10 | × | 13 2 | + | 122863 200 | + | 315273 1000 |
| 方程右边 = | 28327 20 | + | 122863 200 | + | 315273 1000 |
| = | 1172969 500 |
| - | 21 | x | + | 55159 20 | = | 1172969 500 |
| - | 21 | x | = | 1172969 500 | − | 55159 20 |
| - | 21 | x | = | - | 103003 250 |
103003 250 | = | 21 | x |
| 21 | x | = | 103003 250 |
| x | = | 103003 250 | ÷ | 21 |
| = | 103003 250 | × | 1 21 |
| x | = | 103003 5250 |
| x | = | 19.619619 |