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n in (-oo:+oo)
69/46 = n/30 // - n/30
69/46-(n/30) = 0
3/2-1/30*n = 0 // - 3/2
-1/30*n = -3/2 // : -1/30
n = -3/2/(-1/30)
n = 45
n = 45
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