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m in (-oo:+oo)
(1/3)*m^2 = (-1/6)*m+1/2 // - (-1/6)*m+1/2
(1/3)*m^2-((-1/6)*m)-(1/2) = 0
(1/3)*m^2+(1/6)*m-1/2 = 0
1/3*m^2+1/6*m-1/2 = 0
DELTA = (1/6)^2-(-1/2*1/3*4)
DELTA = 25/36
DELTA > 0
m = ((25/36)^(1/2)-1/6)/(1/3*2) or m = (-(25/36)^(1/2)-1/6)/(1/3*2)
m = 1 or m = -3/2
m in { -3/2, 1 }
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