# Definitely not a complex!

Algebra Level 4

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

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