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m in (-oo:+oo)
m/(-2) < 3 // - 3
m/(-2)-3 < 0
-1/2*m-3 < 0 // + 3
-1/2*m < 3 // : -1/2
m > 3/(-1/2)
m > -6
m in (-6:+oo)
(-6:+oo)
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