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N in (-oo:+oo)
N/15 = 4/12 // - 4/12
N/15-(4/12) = 0
N/15-1/3 = 0
1/15*N-1/3 = 0 // + 1/3
1/15*N = 1/3 // : 1/15
N = 1/3/1/15
N = 5
N = 5
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