3Χ+
| Χ-
|
| 1 |
| 2 |
| 5 |
| 3 |
3x+
| 1 |
| 2 |
| 1 |
| 2 |
| 5 |
| 3 |
| 1 |
| 2 |
3x÷3=1
| 1 |
| 6 |
x=
| 7 |
| 18 |
（2）x-
| 4 |
| 9 |
| 10 |
| 21 |
| 5 |
| 9 |
| 10 |
| 21 |
| 5 |
| 9 |
| 5 |
| 9 |
| 10 |
| 21 |
| 5 |
| 9 |
x=
| 6 |
| 7 |
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