| ( | 1001 1000 | + | 71 100 | X | ) | ÷ | ( | X | + | 1 | ) | = | 1491 2000 |
| 方程两边同时乘以: | ( | X | + | 1 | ) |
| ( | 1001 1000 | + | 71 100 | X | ) | = | 1491 2000 | ( | X | + | 1 | ) |
1001 1000 | + | 71 100 | X | = | 1491 2000 | ( | X | + | 1 | ) |
1001 1000 | + | 71 100 | X | = | 1491 2000 | X | + | 1491 2000 | × | 1 |
1001 1000 | + | 71 100 | X | = | 1491 2000 | X | + | 1491 2000 |
71 100 | X | − | 1491 2000 | X | = | 1491 2000 | − | 1001 1000 |
| - | 71 2000 | X | = | 1491 2000 | − | 1001 1000 |
| - | 71 2000 | X | = | - | 511 2000 |
511 2000 | = | 71 2000 | X |
71 2000 | X | = | 511 2000 |
| X | = | 511 2000 | ÷ | 71 2000 |
| = | 511 2000 | × | 2000 71 |
| = | 511 | × | 1 71 |
| X | = | 511 71 |
| X | = | 7.197183 |