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n in (-oo:+oo)
7.9-n/(-1.6) = 8.4 // - 8.4
7.9-n/(-1.6)-8.4 = 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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