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n in (-oo:+oo)
9/26 = n/52 // - n/52
9/26-(n/52) = 0
9/26-1/52*n = 0 // - 9/26
-1/52*n = -9/26 // : -1/52
n = -9/26/(-1/52)
n = 18
n = 18
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