| ( | 10 | ÷ | 7 | ) | x | − | ( | 17 | − | 20 | x | ) | ÷ | 3 | = | 1 |
| 方程左边 = | 10 | ÷ | 7 | × | x | − | ( | 17 | − | 20 | x | ) | × | 1 3 |
| = | 10 7 | x | − | ( | 17 | − | 20 | x | ) | × | 1 3 |
| = | 10 7 | x | − | 17 | × | 1 3 | + | 20 | x | × | 1 3 |
| = | 10 7 | x | − | 17 3 | + | 20 3 | x |
| = | 170 21 | x | − | 17 3 |
170 21 | x | − | 17 3 | = | 1 |
170 21 | x | = | 1 | + | 17 3 |
170 21 | x | = | 20 3 |
| x | = | 20 3 | ÷ | 170 21 |
| = | 20 3 | × | 21 170 |
| = | 2 | × | 7 17 |
| x | = | 14 17 |
| x | = | 0.823529 |