47 10 | = | ( | x | × | 5 | + | 150 | × | 39 10 | ) | ÷ | ( | x | + | 150 | ) |
| 方程两边同时乘以: | ( | x | + | 150 | ) |
47 10 | ( | x | + | 150 | ) | = | ( | x | × | 5 | + | 150 | × | 39 10 | ) |
47 10 | x | + | 47 10 | × | 150 | = | ( | x | × | 5 | + | 150 | × | 39 10 | ) |
47 10 | x | + | 47 10 | × | 150 | = | x | × | 5 | + | 150 | × | 39 10 |
47 10 | x | + | 705 | = | x | × | 5 | + | 585 |
47 10 | x | − | 5 | x | = | 585 | − | 705 |
| - | 3 10 | x | = | 585 | − | 705 |
| - | 3 10 | x | = | - | 120 |
| 120 | = | 3 10 | x |
3 10 | x | = | 120 |
| x | = | 120 | ÷ | 3 10 |
| = | 120 | × | 10 3 |
| = | 40 | × | 10 |
| x | = | 400 |