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