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N in (-oo:+oo)
135/50 = N/10 // - N/10
135/50-(N/10) = 0
27/10-1/10*N = 0 // - 27/10
-1/10*N = -27/10 // : -1/10
N = -27/10/(-1/10)
N = 27
N = 27
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