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N in (-oo:+oo)
N/6 = 10/2 // - 10/2
N/6-(10/2) = 0
N/6-5 = 0
1/6*N-5 = 0 // + 5
1/6*N = 5 // : 1/6
N = 5/1/6
N = 30
N = 30
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