| ( | x | + | 7 2 | ) | ÷ | 3 | = | ( | x | + | 103 10 | ) | ÷ | 7 |
| 方程左边 = | x | × | 1 3 | + | 7 2 | × | 1 3 |
| = | x | × | 1 3 | + | 7 6 |
1 3 | x | + | 7 6 | = | ( | x | + | 103 10 | ) | ÷ | 7 |
| 方程右边 = | x | × | 1 7 | + | 103 10 | × | 1 7 |
| = | x | × | 1 7 | + | 103 70 |
1 3 | x | + | 7 6 | = | 1 7 | x | + | 103 70 |
1 3 | x | − | 1 7 | x | = | 103 70 | − | 7 6 |
4 21 | x | = | 103 70 | − | 7 6 |
4 21 | x | = | 32 105 |
| x | = | 32 105 | ÷ | 4 21 |
| = | 32 105 | × | 21 4 |
| = | 8 5 | × | 1 |
| x | = | 8 5 |
| x | = | 1.6 |