| x | ÷ | ( | x | + | 35 | ) | × | 100 | = | 4 5 | x | ÷ | ( | 4 5 | x | + | 60 | ) | × | 100 |
| 方程两边同时乘以: | ( | x | + | 35 | ) | , | ( | 4 5 | x | + | 60 | ) |
| x | × | 100 | ( | 4 5 | x | + | 60 | ) | = | 4 5 | x | × | 100 | ( | x | + | 35 | ) |
| x | × | 100 | × | 4 5 | x | + | x | × | 100 | × | 60 | = | 4 5 | x | × | 100 | ( | x | + | 35 | ) |
| x | × | 100 | × | 4 5 | x | + | x | × | 100 | × | 60 | = | 4 5 | x | × | 100 | x | + | 4 5 | x | × | 100 | × | 35 |
| x | × | 80 | x | + | x | × | 6000 | = | 80 | x | x | + | 2800 | x |