The answer depends on the functions that you may use.
A possible solution:
cuberoot(8) + cuberoot(8) + cuberoot(8) = 2 + 2 + 2 = 6
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Converting all to eights, it gives three eights minus six eights, so the answer is minus three eights.
Three six
Three of them.
Six of them because 6/8 = 3/4
3 eights would be 24. Dividing by 4, you will get 6.