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JunhaoZ
4 on number line is to the right of 0 four units, and -7 is to the left 7. Count left 7 from 4 and you are at -3.
The answer is -3 because if you are adding to a negative, you have to have the number that you are adding bigger than the negative number, if you know what I mean. So since four is not bigger than seven, you have another negative, which is three.

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