| 6 | x | + | 10 | = | 800 | ÷ | ( | 3 | x | + | 5 | ) |
| 方程两边同时乘以: | ( | 3 | x | + | 5 | ) |
| 6 | x | ( | 3 | x | + | 5 | ) | + | 10 | ( | 3 | x | + | 5 | ) | = | 800 |
| 6 | x | × | 3 | x | + | 6 | x | × | 5 | + | 10 | ( | 3 | x | + | 5 | ) | = | 800 |
| 18 | x | x | + | 30 | x | + | 10 | ( | 3 | x | + | 5 | ) | = | 800 |
| 18 | x | x | + | 30 | x | + | 10 | × | 3 | x | + | 10 | × | 5 | = | 800 |
| 18 | x | x | + | 30 | x | + | 30 | x | + | 50 | = | 800 |
| 18 | x | x | + | 60 | x | + | 50 | = | 800 |
| x1= | - | 25 3 |
| x2=5 |