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m in (-oo:+oo)
-((1/2)*m)-1 = 5/2 // - 5/2
-((1/2)*m)-(5/2)-1 = 0
(-1/2)*m-5/2-1 = 0
-1/2*m-7/2 = 0 // + 7/2
-1/2*m = 7/2 // : -1/2
m = 7/2/(-1/2)
m = -7
m = -7
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