| 30000 | = | ( | 150 | − | 20000 | ÷ | ( | x | + | 102 5 | ) | ) | ( | x | + | 51 5 | ) | + | 200 | ( | x | + | 51 5 | ) |
| 30000 | = | 150 | ( | x | + | 51 5 | ) | − | 20000 | ÷ | ( | x | + | 102 5 | ) | × | ( | x | + | 51 5 | ) | + | 200 | ( | x | + | 51 5 | ) |
| 方程两边同时乘以: | ( | x | + | 102 5 | ) |
| 30000 | ( | x | + | 102 5 | ) | = | 150 | ( | x | + | 51 5 | ) | ( | x | + | 102 5 | ) | − | 20000 | ( | x | + | 51 5 | ) | + | 200 | ( | x | + | 51 5 | ) | ( | x | + | 102 5 | ) |
| 30000 | x | + | 30000 | × | 102 5 | = | 150 | ( | x | + | 51 5 | ) | ( | x | + | 102 5 | ) | − | 20000 | ( | x | + | 51 5 | ) | + | 200 | ( | x | + | 51 5 | ) | ( | x | + | 102 5 | ) |
| 30000 | x | + | 30000 | × | 102 5 | = | 150 | x | ( | x | + | 102 5 | ) | + | 150 | × | 51 5 | ( | x | + | 102 5 | ) | − | 20000 | ( | x | + | 51 5 | ) | + | 200 | ( | x | + | 51 5 | ) | ( | x | + | 102 5 | ) |
| 30000 | x | + | 612000 | = | 150 | x | ( | x | + | 102 5 | ) | + | 1530 | ( | x | + | 102 5 | ) | − | 20000 | ( | x | + | 51 5 | ) | + | 200 | ( | x | + | 51 5 | ) | ( | x | + | 102 5 | ) |
| 30000 | x | + | 612000 | = | 150 | x | x | + | 150 | x | × | 102 5 | + | 1530 | ( | x | + | 102 5 | ) | − | 20000 | ( | x | + | 51 5 | ) | + | 200 | ( | x | + | 51 5 | ) |
| 30000 | x | + | 612000 | = | 150 | x | x | + | 3060 | x | + | 1530 | ( | x | + | 102 5 | ) | − | 20000 | ( | x | + | 51 5 | ) | + | 200 | ( | x | + | 51 5 | ) | ( | x | + | 102 5 | ) |
| 30000 | x | + | 612000 | = | 150 | x | x | + | 3060 | x | + | 1530 | x | + | 1530 | × | 102 5 | − | 20000 | ( | x | + | 51 5 | ) | + | 200 |
| 30000 | x | + | 612000 | = | 150 | x | x | + | 3060 | x | + | 1530 | x | + | 31212 | − | 20000 | ( | x | + | 51 5 | ) | + | 200 | ( | x | + | 51 5 | ) |
| 30000 | x | + | 612000 | = | 150 | x | x | + | 4590 | x | + | 31212 | − | 20000 | ( | x | + | 51 5 | ) | + | 200 | ( | x | + | 51 5 | ) | ( | x | + | 102 5 | ) |
| 30000 | x | + | 612000 | = | 150 | x | x | + | 4590 | x | + | 31212 | − | 20000 | x | − | 20000 | × | 51 5 | + | 200 | ( | x | + | 51 5 | ) |
| 30000 | x | + | 612000 | = | 150 | x | x | + | 4590 | x | + | 31212 | − | 20000 | x | − | 204000 | + | 200 | ( | x | + | 51 5 | ) | ( | x | + | 102 5 | ) |
| 30000 | x | + | 612000 | = | 150 | x | x | − | 15410 | x | − | 172788 | + | 200 | ( | x | + | 51 5 | ) | ( | x | + | 102 5 | ) |
| 30000 | x | + | 612000 | = | 150 | x | x | − | 15410 | x | − | 172788 | + | 200 | x | ( | x | + | 102 5 | ) | + | 200 | × | 51 5 | ( | x | + | 102 5 | ) |
| 30000 | x | + | 612000 | = | 150 | x | x | − | 15410 | x | − | 172788 | + | 200 | x | ( | x | + | 102 5 | ) | + | 2040 | ( | x | + | 102 5 | ) |
| 30000 | x | + | 612000 | = | 150 | x | x | − | 15410 | x | − | 172788 | + | 200 | x | x | + | 200 | x | × | 102 5 |
| 30000 | x | + | 612000 | = | 150 | x | x | − | 15410 | x | − | 172788 | + | 200 | x | x | + | 4080 | x | + | 2040 |
| 30000 | x | + | 612000 | = | 150 | x | x | − | 11330 | x | − | 172788 | + | 200 | x | x | + | 2040 | ( | x | + | 102 5 | ) |
| 30000 | x | + | 612000 | = | 150 | x | x | − | 11330 | x | − | 172788 | + | 200 | x | x | + | 2040 | x | + | 2040 |
| 30000 | x | + | 612000 | = | 150 | x | x | − | 11330 | x | − | 172788 | + | 200 | x | x | + | 2040 | x | + | 41616 |
| 30000 | x | + | 612000 | = | 150 | x | x | − | 9290 | x | − | 131172 | + | 200 | x | x |