2681 1000 | X | ÷ | ( | 1 | + | 1681 1000 | X | ) | = | - | 1 20 | ÷ | 19 20 | × | X | + | 237 500 | ÷ | 19 20 |
| 方程两边同时乘以: | ( | 1 | + | 1681 1000 | X | ) |
2681 1000 | X | = | - | 1 20 | ÷ | 19 20 | × | X | ( | 1 | + | 1681 1000 | X | ) | + | 237 500 | ÷ | 19 20 | × | ( | 1 | + | 1681 1000 | X | ) |
2681 1000 | X | = | - | 1 20 | ÷ | 19 20 | × | X | × | 1 | − | 1 20 | ÷ | 19 20 | × | X | × | 1681 1000 | X | + | 237 500 | ÷ | 19 20 | × | ( | 1 | + | 1681 1000 | X | ) |
2681 1000 | X | = | - | 1 19 | X | − | 1681 19000 | X | X | + | 237 475 | ( | 1 | + | 1681 1000 | X | ) |
2681 1000 | X | = | - | 1 19 | X | − | 1681 19000 | X | X | + | 237 475 | × | 1 | + | 237 475 | × | 1681 1000 | X |
2681 1000 | X | = | - | 1 19 | X | − | 1681 19000 | X | X | + | 237 475 | + | 398397 475000 | X |
2681 1000 | X | = | 373397 475000 | X | − | 1681 19000 | X | X | + | 237 475 |