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m in (-oo:+oo)
(4*m)/(-5) = 8 // - 8
(4*m)/(-5)-8 = 0
-4/5*m-8 = 0 // + 8
-4/5*m = 8 // : -4/5
m = 8/(-4/5)
m = -10
m = -10
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