Question
Shiyun had twice as many buttons as Zoe. After Zoe bought another 84 buttons, Zoe had 2 times as many buttons as Shiyun. How many buttons did Shiyun have?
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Shiyun had twice as many buttons as Zoe. After Zoe bought another 84 buttons, Zoe had 2 times as many buttons as Shiyun. How many buttons did Shiyun have?