| 100 | ÷ | 10 | − | 100 | ÷ | x | − | 100 | ÷ | 15 | = | 8300 | − | 0 | − | ( | - | 3910 | ) |
| 方程两边同时乘以: | x |
| 100 | ÷ | 10 | × | x | − | 100 | − | 100 | ÷ | 15 | × | x | = | 8300 | x | − | 0 | − | ( | - | 3910 | ) | x |
| 100 | ÷ | 10 | × | x | − | 100 | − | 100 | ÷ | 15 | × | x | = | 8300 | x | − | 0 | + | 3910 | x |
| 10 | x | − | 100 | − | 20 3 | x | = | 8300 | x | − | 0 | + | 3910 | x |
10 3 | x | − | 100 | = | 12210 | x | − | 0 |
10 3 | x | − | 12210 | x | = | 100 |
| - | 36620 3 | x | = | 100 |
| - | 100 | = | 36620 3 | x |
36620 3 | x | = | - | 100 |
| x | = | - | 100 | ÷ | 36620 3 |
| = | - | 100 | × | 3 36620 |
| = | - | 5 | × | 3 1831 |
| x | = | - | 15 1831 |
| x | = | - 0.008192 |