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1 February, 01:00

A teacher wrote the numbers 10,-2, 4, 3, - 1, - 7,1 on a white board. the teacher asked which number should she write in order to make the sum of all the numbers equal to zero?

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  1. 1 February, 01:14
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    Let x be that number:

    x + 10 - 2 + 4 + 3 - 1 - 7 + 1 = 0

    x + 8 = 0

    and x = - 8
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