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m in (-oo:+oo)
-m/2 = -7.5 // + 7.5
7.5-m/2 = 0
7.5-1/2*m = 0 // - 7.5
-1/2*m = -7.5 // : -1/2
m = -7.5/(-1/2)
m = 15
m = 15
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