| 20 | ÷ | 6679 50 | + | X | ÷ | 1000 | = | 11 6250 | ( | 278 5 | + | X | ) |
| 方程左边 = | 1000 6679 | + | X | × | 1 1000 |
1000 6679 | + | 1 1000 | X | = | 11 6250 | ( | 278 5 | + | X | ) |
| 方程右边 = | 11 6250 | × | 278 5 | + | 11 6250 | X |
| = | 1529 15625 | + | 11 6250 | X |
1000 6679 | + | 1 1000 | X | = | 1529 15625 | + | 11 6250 | X |
1 1000 | X | − | 11 6250 | X | = | 1529 15625 | − | 1000 6679 |
| - | 19 25000 | X | = | 1529 15625 | − | 1000 6679 |
| - | 19 25000 | X | = | - | 5412809 104359375 |
5412809 104359375 | = | 19 25000 | X |
19 25000 | X | = | 5412809 104359375 |
| X | = | 5412809 104359375 | ÷ | 19 25000 |
| = | 5412809 104359375 | × | 25000 19 |
| = | 5412809 33395 | × | 8 19 |
| X | = | 43302472 634505 |
| X | = | 68.246069 |