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n in (-oo:+oo)
n/(-1.6)+7.9 = 8.4 // - 8.4
n/(-1.6)-8.4+7.9 = 0
-0.625*n-0.5 = 0 // + 0.5
-0.625*n = 0.5 // : -0.625
n = 0.5/(-0.625)
n = -0.8
n = -0.8
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