| 70 | ÷ | ( | x | + | 118 | ) | × | 100 100 | × | 12 | = | 649 5000 |
| 方程两边同时乘以: | ( | x | + | 118 | ) |
| 70 | × | 100 100 | × | 12 | = | 649 5000 | ( | x | + | 118 | ) |
| 70 | × | 100 100 | × | 12 | = | 649 5000 | x | + | 649 5000 | × | 118 |
| 840 | = | 649 5000 | x | + | 38291 2500 |
| - | 649 5000 | x | = | 38291 2500 | − | 840 |
| - | 649 5000 | x | = | - | 2061709 2500 |
2061709 2500 | = | 649 5000 | x |
649 5000 | x | = | 2061709 2500 |
| x | = | 2061709 2500 | ÷ | 649 5000 |
| = | 2061709 2500 | × | 5000 649 |
| = | 2061709 | × | 2 649 |
| x | = | 4123418 649 |
| x | = | 6353.494607 |