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How can 9+3 =12 help you solve 12-9?

How can 9+3 =12 help you solve 12-9?
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5 votes
How can 9+3 =12 help you solve 12-9?

User Vandale
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2 Answers

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Well you know that 9+3=12 so you can reverse it and do 12-9=3 .Because 3 is the only one left in the equation of 9+3=12.
User Bbrodsky
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9+3=12, 12-9=3, since those three numbers are in the first equation.
User DiligentKarma
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