| ( | 10000 | − | ( | ( | 10000 | ÷ | x | + | 10000 | ÷ | 90 | ) | − | ( | 13500 | ÷ | 160 | ) | ) | ( | x | + | 50 | ) | ) | ÷ | x | = | 10000 | ÷ | 160 |
| 方程两边同时乘以: | x |
| ( | 10000 | − | ( | ( | 10000 | ÷ | x | + | 10000 | ÷ | 90 | ) | − | ( | 13500 | ÷ | 160 | ) | ) | ( | x | + | 50 | ) | ) | = | 10000 | ÷ | 160 | × | x |
| 10000 | − | ( | ( | 10000 | ÷ | x | + | 10000 | ÷ | 90 | ) | − | ( | 13500 | ÷ | 160 | ) | ) | ( | x | + | 50 | ) | = | 10000 | ÷ | 160 | × | x |
| 10000 | − | ( | ( | 10000 | ÷ | x | + | 10000 | ÷ | 90 | ) | − | ( | 13500 | ÷ | 160 | ) | ) | ( | x | + | 50 | ) | = | 125 2 | x |
| 10000 | − | ( | 10000 | ÷ | x | + | 10000 | ÷ | 90 | ) | ( | x | + | 50 | ) | + | ( | 13500 | ÷ | 160 | ) | ( | x | + | 50 | ) | = | 125 2 | x |
| 10000 | − | 10000 | ÷ | x | × | ( | x | + | 50 | ) | − | 10000 | ÷ | 90 | × | ( | x | + | 50 | ) | + | ( | 13500 | ÷ | 160 | ) | ( | x | + | 50 | ) | = | 125 2 | x |
| 10000 | − | 10000 | ÷ | x | × | ( | x | + | 50 | ) | − | 1000 9 | ( | x | + | 50 | ) | + | ( | 13500 | ÷ | 160 | ) | ( | x | + | 50 | ) | = | 125 2 | x |
| 方程两边同时乘以: | x |
| 10000 | x | − | 10000 | ( | x | + | 50 | ) | − | 1000 9 | ( | x | + | 50 | ) | x | + | ( | 13500 | ÷ | 160 | ) | ( | x | + | 50 | ) | x | = | 125 2 | x | x |
| 10000 | x | − | 10000 | x | − | 10000 | × | 50 | − | 1000 9 | ( | x | + | 50 | ) | x | + | ( | 13500 | ÷ | 160 | ) | ( | x | + | 50 | ) | x | = | 125 2 | x | x |
| 10000 | x | − | 10000 | x | − | 500000 | − | 1000 9 | ( | x | + | 50 | ) | x | + | ( | 13500 | ÷ | 160 | ) | ( | x | + | 50 | ) | x | = | 125 2 | x | x |
| 0 | x | − | 500000 | − | 1000 9 | ( | x | + | 50 | ) | x | + | ( | 13500 | ÷ | 160 | ) | ( | x | + | 50 | ) | x | = | 125 2 | x | x |
| - | 500000 | − | 1000 9 | x | x | − | 1000 9 | × | 50 | x | + | ( | 13500 | ÷ | 160 | ) | ( | x | + | 50 | ) | x | = | 125 2 | x | x |
| - | 500000 | − | 1000 9 | x | x | − | 50000 9 | x | + | ( | 13500 | ÷ | 160 | ) | ( | x | + | 50 | ) | x | = | 125 2 | x | x |
| - | 500000 | − | 1000 9 | x | x | − | 50000 9 | x | + | 13500 | ÷ | 160 | × | ( | x | + | 50 | ) | x | = | 125 2 | x | x |
| - | 500000 | − | 1000 9 | x | x | − | 50000 9 | x | + | 675 8 | ( | x | + | 50 | ) | x | = | 125 2 | x | x |
| - | 500000 | − | 1000 9 | x | x | − | 50000 9 | x | + | 675 8 | x | x | + | 675 8 | × | 50 | x | = | 125 2 | x | x |
| - | 500000 | − | 1000 9 | x | x | − | 50000 9 | x | + | 675 8 | x | x | + | 16875 4 | x | = | 125 2 | x | x |
| - | 500000 | − | 1000 9 | x | x | − | 48125 36 | x | + | 675 8 | x | x | = | 125 2 | x | x |