| ( | x | + | 1 | ) | ÷ | 3 10 | − | ( | 1 5 | x | − | 1 | ) | ÷ | 7 10 | = | 1 |
| 方程左边 = | x | × | 10 3 | + | 1 | × | 10 3 | − | ( | 1 5 | x | − | 1 | ) | × | 10 7 |
| = | x | × | 10 3 | + | 10 3 | − | ( | 1 5 | x | − | 1 | ) | × | 10 7 |
| = | 10 3 | x | + | 10 3 | − | 1 5 | x | × | 10 7 | + | 1 | × | 10 7 |
| = | 10 3 | x | + | 10 3 | − | 2 7 | x | + | 10 7 |
| = | 64 21 | x | + | 100 21 |
64 21 | x | + | 100 21 | = | 1 |
64 21 | x | = | 1 | − | 100 21 |
64 21 | x | = | - | 79 21 |
| x | = | - | 79 21 | ÷ | 64 21 |
| = | - | 79 21 | × | 21 64 |
| = | - | 79 | × | 1 64 |
| x | = | - | 79 64 |
| x | = | - 1.234375 |