| 10000 | ÷ | 70 | × | ( | x | + | 66 | ) | + | 500 | ÷ | 70 | × | x | = | 27600 |
| 方程左边 = | 1000 7 | ( | x | + | 66 | ) | + | 50 7 | x |
1000 7 | ( | x | + | 66 | ) | + | 50 7 | x | = | 27600 |
| 方程左边 = | 1000 7 | x | + | 1000 7 | × | 66 | + | 50 7 | x |
| = | 1000 7 | x | + | 66000 7 | + | 50 7 | x |
| = | 150 | x | + | 66000 7 |
| 150 | x | + | 66000 7 | = | 27600 |
| 150 | x | = | 27600 | − | 66000 7 |
| 150 | x | = | 127200 7 |
| x | = | 127200 7 | ÷ | 150 |
| = | 127200 7 | × | 1 150 |
| = | 848 7 | × | 1 |
| x | = | 848 7 |
| x | = | 121.142857 |