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m in (-oo:+oo)
-m/8 = 5/8 // - 5/8
-m/8-(5/8) = 0
-m/8-5/8 = 0
-1/8*m-5/8 = 0 // + 5/8
-1/8*m = 5/8 // : -1/8
m = 5/8/(-1/8)
m = -5
m = -5
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