Question 338553
It's {{{d^(15/5) = d^3}}}
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If you think it's either d^3 or d^5, sub a small number for d and try it.
d = 2
2^15 = 32768
2^3 = 8
2^5 = 32
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Then try them
8^5 = 32768  it works  d^3 works
32^5 = 33554432 d^5 doesn't work