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N in (-oo:+oo)
-9 = N/2.8 // - N/2.8
-(N/2.8)-9 = 0
-0.35714286*N-9 = 0
-0.35714286*N-9 = 0 // + 9
-0.35714286*N = 9 // : -0.35714286
N = 9/(-0.35714286)
N = -25.1999998
N = -25.1999998
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