Definitely not a complex!

Algebra Level 4

If kk is a positive integer, then k77+k55+2k33k105\dfrac { { k }^{ 7 } }{ 7 } +\dfrac { { k }^{ 5 } }{ 5 } +\dfrac { { 2k }^{ 3 } }{ 3 } -\dfrac { k }{ 105 } is definitely a/an _________\text{\_\_\_\_\_\_\_\_\_} .

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