| ( | 20 | − | x | ) | ÷ | 15 | = | 107 5 | ÷ | ( | 407 5 | − | 501 10 | ) |
| 方程两边同时乘以: | ( | 407 5 | − | 501 10 | ) |
| ( | 20 | − | x | ) | ÷ | 15 | × | ( | 407 5 | − | 501 10 | ) | = | 107 5 |
| 20 | ÷ | 15 | × | ( | 407 5 | − | 501 10 | ) | − | x | ÷ | 15 | × | ( | 407 5 | − | 501 10 | ) | = | 107 5 |
4 3 | ( | 407 5 | − | 501 10 | ) | − | x | × | 1 15 | ( | 407 5 | − | 501 10 | ) | = | 107 5 |
4 3 | × | 407 5 | − | 4 3 | × | 501 10 | − | x | × | 1 15 | ( | 407 5 | − | 501 10 | ) | = | 107 5 |
1628 15 | − | 334 5 | − | x | × | 1 15 | ( | 407 5 | − | 501 10 | ) | = | 107 5 |
626 15 | − | x | × | 1 15 | ( | 407 5 | − | 501 10 | ) | = | 107 5 |
626 15 | − | x | × | 1 15 | × | 407 5 | + | x | × | 1 15 | × | 501 10 | = | 107 5 |
626 15 | − | x | × | 407 75 | + | x | × | 167 50 | = | 107 5 |
626 15 | − | 313 150 | x | = | 107 5 |
| - | 313 150 | x | = | 107 5 | − | 626 15 |
| - | 313 150 | x | = | - | 61 3 |
61 3 | = | 313 150 | x |
313 150 | x | = | 61 3 |
| x | = | 61 3 | ÷ | 313 150 |
| = | 61 3 | × | 150 313 |
| = | 61 | × | 50 313 |
| x | = | 3050 313 |
| x | = | 9.744409 |