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题目内容 （请给出正确答案）
单选题
If 2x+3＝9, what is 4x+6 ?
A

3

B

4

C

6

D

9

E

18

参考答案

参考解析
解析：
因为2x+3＝9，所以4x+6=2(2x+3)=2×9=18。
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