1 2 | x | + | 4 5 | x | + | 7 5 | = | 21 2 |
| 方程左边 = | 13 10 | x | + | 7 5 |
13 10 | x | + | 7 5 | = | 21 2 |
13 10 | x | = | 21 2 | − | 7 5 |
13 10 | x | = | 91 10 |
| x | = | 91 10 | ÷ | 13 10 |
| = | 91 10 | × | 10 13 |
| = | 7 | × | 1 |
| x | = | 7 |
| ( | x | − | 23 5 | ) | × | 23 10 | = | 4669 500 |
| 方程左边 = | x | × | 23 10 | − | 23 5 | × | 23 10 |
| = | x | × | 23 10 | − | 529 50 |
23 10 | x | − | 529 50 | = | 4669 500 |
23 10 | x | = | 4669 500 | + | 529 50 |
23 10 | x | = | 9959 500 |
| x | = | 9959 500 | ÷ | 23 10 |
| = | 9959 500 | × | 10 23 |
| = | 433 50 | × | 1 |
| x | = | 433 50 |
| x | = | 8.66 |
2 5 | x | + | 11 10 | = | 33 10 | + | 1 5 | x |
2 5 | x | − | 1 5 | x | = | 33 10 | − | 11 10 |
1 5 | x | = | 33 10 | − | 11 10 |
1 5 | x | = | 11 5 |
| x | = | 11 5 | ÷ | 1 5 |
| = | 11 5 | × | 5 |
| = | 11 | × | 1 |
| x | = | 11 |
1 5 | x | + | 1 5 | x | + | 14 5 | = | 36 5 |
| 方程左边 = | 2 5 | x | + | 14 5 |
2 5 | x | + | 14 5 | = | 36 5 |
2 5 | x | = | 36 5 | − | 14 5 |
2 5 | x | = | 22 5 |
| x | = | 22 5 | ÷ | 2 5 |
| = | 22 5 | × | 5 2 |
| = | 11 | × | 1 |
| x | = | 11 |
3 2 | ( | x | − | 20 | ) | = | 90 |
| 方程左边 = | 3 2 | x | − | 3 2 | × | 20 |
| = | 3 2 | x | − | 30 |
3 2 | x | − | 30 | = | 90 |
3 2 | x | = | 90 | + | 30 |
3 2 | x | = | 120 |
| x | = | 120 | ÷ | 3 2 |
| = | 120 | × | 2 3 |
| = | 40 | × | 2 |
| x | = | 80 |
1 10 | x | + | 3 5 | x | − | 39 10 | = | 26 5 |
| 方程左边 = | 7 10 | x | − | 39 10 |
7 10 | x | − | 39 10 | = | 26 5 |
7 10 | x | = | 26 5 | + | 39 10 |
7 10 | x | = | 91 10 |
| x | = | 91 10 | ÷ | 7 10 |
| = | 91 10 | × | 10 7 |
| = | 13 | × | 1 |
| x | = | 13 |