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In math when you are given a negative and a positive number, you should write down the sign of the greatest number and subtract the smaller number from the greatest number. In the problem 3 - 9, three is the positive number, and nine is the negative number. This means you should write down the negative number's sign and subtract 3 from 9, and your answer should be -6.

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Q: What does negative plus positive equal to?
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