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m in (-oo:+oo)
-56 = (5/(-4))*m // - (5/(-4))*m
-((5/(-4))*m)-56 = 0
(5/4)*m-56 = 0
5/4*m-56 = 0 // + 56
5/4*m = 56 // : 5/4
m = 56/5/4
m = 224/5
m = 224/5
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