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N in (-oo:+oo)
N/4 = 4.5 // - 4.5
N/4-4.5 = 0
1/4*N-4.5 = 0 // + 4.5
1/4*N = 4.5 // : 1/4
N = 4.5/1/4
N = 18
N = 18
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