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m in (-oo:+oo)
(m/2)*m+6 = 4/2 // - 4/2
(m/2)*m-(4/2)+6 = 0
(m/2)*m-2+6 = 0
1/2*m^2 = -4 // : 1/2
m^2 = -8
m belongs to the empty set
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