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N in (-oo:+oo)
N/4 = 5/9 // - 5/9
N/4-(5/9) = 0
N/4-5/9 = 0
1/4*N-5/9 = 0 // + 5/9
1/4*N = 5/9 // : 1/4
N = 5/9/1/4
N = 20/9
N = 20/9
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