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m in (-oo:+oo)
(m^2)/3-((2*m^1)/3)-8 = 0
(m^2)/3+(-2/3)*m-8 = 0
1/3*m^2-2/3*m-8 = 0
DELTA = (-2/3)^2-(-8*1/3*4)
DELTA = 100/9
DELTA > 0
m = ((100/9)^(1/2)+2/3)/(1/3*2) or m = (2/3-(100/9)^(1/2))/(1/3*2)
m = 6 or m = -4
m in { -4, 6 }
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