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N in (-oo:+oo)
N/10 = 3/6 // - 3/6
N/10-(3/6) = 0
N/10-1/2 = 0
1/10*N-1/2 = 0 // + 1/2
1/10*N = 1/2 // : 1/10
N = 1/2/1/10
N = 5
N = 5
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