| X | ÷ | 1000 | + | ( | 73 | − | X | ) | ÷ | 1650 | + | 20 | ÷ | 6679 50 | + | 2 | ÷ | 53 | = | 1 5 |
| 方程左边 = | X | × | 1 1000 | + | ( | 73 | − | X | ) | × | 1 1650 | + | 1000 6679 | + | 2 53 |
| = | 1 1000 | X | + | ( | 73 | − | X | ) | × | 1 1650 | + | 66358 353987 |
1 1000 | X | + | ( | 73 | − | X | ) | × | 1 1650 | + | 66358 353987 | = | 1 5 |
| 方程左边 = | 1 1000 | X | + | 73 | × | 1 1650 | − | X | × | 1 1650 | + | 66358 353987 |
| = | 1 1000 | X | + | 73 1650 | − | X | × | 1 1650 | + | 66358 353987 |
| = | 13 33000 | X | + | 135331751 584078550 |
13 33000 | X | + | 135331751 584078550 | = | 1 5 |
13 33000 | X | = | 1 5 | − | 135331751 584078550 |
13 33000 | X | = | - | 18516041 584078550 |
| X | = | - | 18516041 584078550 | ÷ | 13 33000 |
| = | - | 18516041 584078550 | × | 33000 13 |
| = | - | 18516041 353987 | × | 20 13 |
| X | = | - | 370320820 4601831 |
| X | = | - 80.472495 |