So I crunch rhymes, but sometimes when you combine
Appeal with the skin color of mine

from Eminem – Rap God Lyrics on Rap Genius

Meaning

Eminem is acknowledging that his race (white) helped to expedite his success (even though he is still lyrically dominant), which backfires because with success comes expectations and censorship.

Em explains his thoughts on this matter in “White America”:

Let’s do the math: if I was black, I woulda sold half

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