| 7 | ÷ | 102 | + | 3 | ÷ | 6679 50 | + | X | ÷ | 447 10 | + | ( | 437 5 | − | X | ) | ÷ | 1000 | = | 17 50 |
| 方程左边 = | 7 102 | + | 150 6679 | + | X | × | 10 447 | + | ( | 437 5 | − | X | ) | × | 1 1000 |
| = | 62053 681258 | + | 10 447 | X | + | ( | 437 5 | − | X | ) | × | 1 1000 |
62053 681258 | + | 10 447 | X | + | ( | 437 5 | − | X | ) | × | 1 1000 | = | 17 50 |
| 方程左边 = | 62053 681258 | + | 10 447 | X | + | 437 5 | × | 1 1000 | − | X | × | 1 1000 |
| = | 62053 681258 | + | 10 447 | X | + | 437 5000 | − | X | × | 1 1000 |
| = | 303987373 1703145000 | + | 9553 447000 | X |
303987373 1703145000 | + | 9553 447000 | X | = | 17 50 |
9553 447000 | X | = | 17 50 | − | 303987373 1703145000 |