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