| ( | 23100 | + | 117 10 | x | ) | ÷ | ( | 1500 | + | x | ) | = | 47 4 |
| 方程两边同时乘以: | ( | 1500 | + | x | ) |
| ( | 23100 | + | 117 10 | x | ) | = | 47 4 | ( | 1500 | + | x | ) |
| 23100 | + | 117 10 | x | = | 47 4 | ( | 1500 | + | x | ) |
| 23100 | + | 117 10 | x | = | 47 4 | × | 1500 | + | 47 4 | x |
| 23100 | + | 117 10 | x | = | 17625 | + | 47 4 | x |
117 10 | x | − | 47 4 | x | = | 17625 | − | 23100 |
| - | 1 20 | x | = | 17625 | − | 23100 |
| - | 1 20 | x | = | - | 5475 |
| 5475 | = | 1 20 | x |
1 20 | x | = | 5475 |
| x | = | 5475 | ÷ | 1 20 |
| = | 5475 | × | 20 |
| x | = | 109500 |