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