| 70 | × | 10000 | ( | 1 | + | x | ) | = | 12 | × | 32500 | ÷ | 9 |
| 方程左边 = | 700000 | ( | 1 | + | x | ) |
| 700000 | ( | 1 | + | x | ) | = | 12 | × | 32500 | ÷ | 9 |
| 方程左边 = | 700000 | × | 1 | + | 700000 | x |
| = | 700000 | + | 700000 | x |
| 700000 | + | 700000 | x | = | 12 | × | 32500 | ÷ | 9 |
| 方程右边 = | 130000 3 |
| 700000 | + | 700000 | x | = | 130000 3 |
| 700000 | x | = | 130000 3 | − | 700000 |
| 700000 | x | = | - | 1970000 3 |
| x | = | - | 1970000 3 | ÷ | 700000 |
| = | - | 1970000 3 | × | 1 700000 |
| = | - | 197 3 | × | 1 70 |
| x | = | - | 197 210 |
| x | = | - 0.938095 |