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m in (-oo:+oo)
m^2-((3*m)/4) = 0
m^2+(-3/4)*m = 0
m^2-3/4*m = 0
DELTA = (-3/4)^2-(0*1*4)
DELTA = 9/16
DELTA > 0
m = ((9/16)^(1/2)+3/4)/(1*2) or m = (3/4-(9/16)^(1/2))/(1*2)
m = 3/4 or m = 0
m in { 0, 3/4 }
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