| 7150 | x | + | 4250 | ( | 19 | − | x | ) | = | 225200 |
| 方程左边 = | 7150 | x | + | 4250 | × | 19 | − | 4250 | x |
| = | 7150 | x | + | 80750 | − | 4250 | x |
| = | 2900 | x | + | 80750 |
| 2900 | x | + | 80750 | = | 225200 |
| 2900 | x | = | 225200 | − | 80750 |
| 2900 | x | = | 144450 |
| x | = | 144450 | ÷ | 2900 |
| = | 144450 | × | 1 2900 |
| = | 2889 | × | 1 58 |
| x | = | 2889 58 |
| x | = | 49.810345 |