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N in (-oo:+oo)
N/4 = 35/20 // - 35/20
N/4-(35/20) = 0
N/4-7/4 = 0
1/4*N-7/4 = 0 // + 7/4
1/4*N = 7/4 // : 1/4
N = 7/4/1/4
N = 7
N = 7
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