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m in (-oo:+oo)
5/13 = m/52 // - m/52
5/13-(m/52) = 0
5/13-1/52*m = 0 // - 5/13
-1/52*m = -5/13 // : -1/52
m = -5/13/(-1/52)
m = 20
m = 20
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