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      ·  7 years ago 

    The problem seems to be that you need to create a even number out of 3 uneven numbers. Since that is impossible we must look for tricks.
    Trick #1: an empty box has the shape of a 0, so we could leave it empty and interpret it as such, then fill the other boxes with 15.
    Trick #2: use an additional "+" inside a box: (3+7) + 9 + 11.
    Trick #3: use a decimal point: 3.5 + 11.5 + 15
    more?

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        ·  7 years ago (edited)

      good try

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          ·  7 years ago 

        Try? I would say I have succeeded.
        When will you post your answer?

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