| 0 | = | 10 100 | ( | 70 100 | − | 37 100 | ) | − | ( | 1 | + | 10 100 | ) | × | 10 100 | ( | 1 | − | x | ) |
| 方程右边 = | 10 100 | × | 70 100 | − | 10 100 | × | 37 100 | − | ( | 1 | + | 10 100 | ) | × | 10 100 | ( | 1 | − | x | ) |
| = | 7 100 | − | 37 1000 | − | ( | 1 | + | 10 100 | ) | × | 10 100 | ( | 1 | − | x | ) |
| = | 33 1000 | − | ( | 1 | + | 10 100 | ) | × | 10 100 | ( | 1 | − | x | ) |
| = | 33 1000 | − | 1 | × | 10 100 | ( | 1 | − | x | ) | − | 10 100 | × | 10 100 | ( | 1 | − | x | ) |
| = | 33 1000 | − | 1 10 | ( | 1 | − | x | ) | − | 1 100 | ( | 1 | − | x | ) |
| = | 33 1000 | − | 1 10 | × | 1 | + | 1 10 | x | − | 1 100 | ( | 1 | − | x | ) |
| = | 33 1000 | − | 1 10 | + | 1 10 | x | − | 1 100 | ( | 1 | − | x | ) |
| = | - | 67 1000 | + | 1 10 | x | − | 1 100 | ( | 1 | − | x | ) |
| = | - | 67 1000 | + | 1 10 | x | − | 1 100 | × | 1 | + | 1 100 | x |
| = | - | 67 1000 | + | 1 10 | x | − | 1 100 | + | 1 100 | x |
| = | - | 77 1000 | + | 11 100 | x |
| 0 | = | - | 77 1000 | + | 11 100 | x |
| - | 11 100 | x | = | - | 77 1000 | − | 0 |
| - | 11 100 | x | = | - | 77 1000 |
77 1000 | = | 11 100 | x |
11 100 | x | = | 77 1000 |
| x | = | 77 1000 | ÷ | 11 100 |
| = | 77 1000 | × | 100 11 |
| = | 7 10 | × | 1 |
| x | = | 7 10 |
| x | = | 0.7 |