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whats 9+10=21

 Feb 4, 2015
 #1
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a question

 Feb 4, 2015
 #2
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9+10=21 is a question but x+y=21 could be an equation

 Feb 4, 2015
 #3
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also its 10 + 11 not 9 +10

 Feb 4, 2015

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