| ( | 200 | − | 110 | ) | ÷ | ( | 1 | + | ( | 3 | ÷ | 4 | ) | ) | = | x |
| 方程两边同时乘以: | ( | 1 | + | ( | 3 | ÷ | 4 | ) | ) |
| ( | 200 | − | 110 | ) | = | x | ( | 1 | + | ( | 3 | ÷ | 4 | ) | ) |
| 200 | − | 110 | = | x | ( | 1 | + | ( | 3 | ÷ | 4 | ) | ) |
| 200 | − | 110 | = | x | × | 1 | + | x | ( | 3 | ÷ | 4 | ) |
| 90 | = | 1 | x | + | x | ( | 3 | ÷ | 4 | ) |
| 90 | = | 1 | x | + | x | × | 3 | ÷ | 4 |
| 90 | = | 1 | x | + | x | × | 3 4 |
| 90 | = | 7 4 | x |
| - | 7 4 | x | = | - | 90 |
| 90 | = | 7 4 | x |
7 4 | x | = | 90 |
| x | = | 90 | ÷ | 7 4 |
| = | 90 | × | 4 7 |
| x | = | 360 7 |
| x | = | 51.428571 |