| ( | x | − | 19 5 | ) | × | 7 10 | = | 84 25 |
| 方程左边 = | x | × | 7 10 | − | 19 5 | × | 7 10 |
| = | x | × | 7 10 | − | 133 50 |
7 10 | x | − | 133 50 | = | 84 25 |
7 10 | x | = | 84 25 | + | 133 50 |
7 10 | x | = | 301 50 |
| x | = | 301 50 | ÷ | 7 10 |
| = | 301 50 | × | 10 7 |
| = | 43 5 | × | 1 |
| x | = | 43 5 |
| x | = | 8.6 |
| 4 | x | + | 44 | = | 100 | − | 4 | x |
| 4 | x | + | 4 | x | = | 100 | − | 44 |
| 8 | x | = | 100 | − | 44 |
| 8 | x | = | 56 |
| x | = | 56 | ÷ | 8 |
| = | 56 | × | 1 8 |
| = | 7 | × | 1 |
| x | = | 7 |
| 4 | x | × | 5 | − | 2 | x | − | 18 | = | 216 |
| 方程左边 = | 20 | x | − | 2 | x | − | 18 |
| = | 18 | x | − | 18 |
| 18 | x | − | 18 | = | 216 |
| 18 | x | = | 216 | + | 18 |
| 18 | x | = | 234 |
| x | = | 234 | ÷ | 18 |
| = | 234 | × | 1 18 |
| = | 13 | × | 1 |
| x | = | 13 |
| 4 | x | × | 3 | + | 2 | x | × | 2 | − | 39 | = | 217 |
| 方程左边 = | 12 | x | + | 4 | x | − | 39 |
| = | 16 | x | − | 39 |
| 16 | x | − | 39 | = | 217 |
| 16 | x | = | 217 | + | 39 |
| 16 | x | = | 256 |
| x | = | 256 | ÷ | 16 |
| = | 256 | × | 1 16 |
| = | 16 | × | 1 |
| x | = | 16 |
| 7 | ( | x | − | 6 5 | ) | = | 21 10 |
| 方程左边 = | 7 | x | − | 7 | × | 6 5 |
| = | 7 | x | − | 42 5 |
| 7 | x | − | 42 5 | = | 21 10 |
| 7 | x | = | 21 10 | + | 42 5 |
| 7 | x | = | 21 2 |
| x | = | 21 2 | ÷ | 7 |
| = | 21 2 | × | 1 7 |
| = | 3 2 | × | 1 |
| x | = | 3 2 |
| x | = | 1.5 |
| 3 | x | × | 4 | + | 12 | = | 188 | − | 4 | x |
| 方程左边 = | 12 | x | + | 12 |
| 12 | x | + | 12 | = | 188 | − | 4 | x |
| 12 | x | + | 4 | x | = | 188 | − | 12 |
| 16 | x | = | 188 | − | 12 |
| 16 | x | = | 176 |
| x | = | 176 | ÷ | 16 |
| = | 176 | × | 1 16 |
| = | 11 | × | 1 |
| x | = | 11 |