117 100 | x | + | 108 100 | ( | 200 | − | x | ) | = | 200 | + | 277 10 |
| 方程左边 = | 117 100 | x | + | 108 100 | × | 200 | − | 108 100 | x |
| = | 117 100 | x | + | 216 | − | 108 100 | x |
| = | 9 100 | x | + | 216 |
9 100 | x | + | 216 | = | 200 | + | 277 10 |
| 方程右边 = | 2277 10 |
9 100 | x | + | 216 | = | 2277 10 |
9 100 | x | = | 2277 10 | − | 216 |
9 100 | x | = | 117 10 |
| x | = | 117 10 | ÷ | 9 100 |
| = | 117 10 | × | 100 9 |
| = | 13 | × | 10 |
| x | = | 130 |