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10 December, 04:43

What can be added to - 1 so it can be a positive 1?

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  1. 10 December, 08:09
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    So represent missing number with x

    x means unknown so

    x+-1=+1

    adding a negative means subtraction

    x-1=1

    you can do anything to an equation as long as you do it to both sides

    add 1 to both sides

    x+1-1=1+1

    x+0=2

    x=2

    the number is 2
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