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N in (-oo:+oo)
0.36/0.9 = N/0.5 // - N/0.5
0.36/0.9-(N/0.5) = 0
0.36/0.9-2*N = 0
0.4-2*N = 0 // - 0.4
-2*N = -0.4 // : -2
N = -0.4/(-2)
N = 0.2
N = 0.2
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