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