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m in (-oo:+oo)
(1/3)*m^2-((1/5)*m)-(1/3) = 0
(1/3)*m^2+(-1/5)*m-1/3 = 0
1/3*m^2-1/5*m-1/3 = 0
DELTA = (-1/5)^2-(-1/3*1/3*4)
DELTA = 109/225
DELTA > 0
m = ((109/225)^(1/2)+1/5)/(1/3*2) or m = (1/5-(109/225)^(1/2))/(1/3*2)
m = 3/2*((109/225)^(1/2)+1/5) or m = 3/2*(1/5-(109/225)^(1/2))
m in { 3/2*(1/5-(109/225)^(1/2)), 3/2*((109/225)^(1/2)+1/5) }
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