| 1200 | x | + | ( | ( | 200000 | − | 1200 | x | ) | ÷ | 800 | ) | = | 200000 |
| 方程左边 = | 1200 | x | + | ( | 200000 | − | 1200 | x | ) | ÷ | 800 |
| = | 1200 | x | + | 200000 | × | 1 800 | − | 1200 | x | × | 1 800 |
| = | 1200 | x | + | 250 | − | 3 2 | x |
| = | 2397 2 | x | + | 250 |
2397 2 | x | + | 250 | = | 200000 |
2397 2 | x | = | 200000 | − | 250 |
2397 2 | x | = | 199750 |
| x | = | 199750 | ÷ | 2397 2 |
| = | 199750 | × | 2 2397 |
| = | 11750 | × | 2 141 |
| x | = | 23500 141 |
| x | = | 500 3 |
| x | = | 166.666667 |