8 5 | ( | 100 | ÷ | ( | 100 | + | x | ) | ) | = | 3 4 |
8 5 | × | 100 | ÷ | ( | 100 | + | x | ) | = | 3 4 |
| 160 | ÷ | ( | 100 | + | x | ) | = | 3 4 |
| 方程两边同时乘以: | ( | 100 | + | x | ) |
| 160 | = | 3 4 | ( | 100 | + | x | ) |
| 160 | = | 3 4 | × | 100 | + | 3 4 | x |
| 160 | = | 75 | + | 3 4 | x |
| - | 3 4 | x | = | 75 | − | 160 |
| - | 3 4 | x | = | - | 85 |
| 85 | = | 3 4 | x |
3 4 | x | = | 85 |
| x | = | 85 | ÷ | 3 4 |
| = | 85 | × | 4 3 |
| x | = | 340 3 |
| x | = | 113.333333 |