Niggas tryna subtract my life, my mathematics is precise
I carry the 9, so fucking with me just ain't the answer

from Jay Z – This Life Forever Lyrics on Rap Genius

Meaning

To get my philosophical on, isn’t mathematics the ultimate game? In this verse, mathematics and chess (games of logic, in other words) are a lyrical focus

Jay “carries the 9,” meaning he is wearing his 9mm pistol. We all remember carrying the remainder from all that bullshit long division we had to do in school

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