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m in (-oo:+oo)
27*m^2-((3/15)*m)-5 = 0
27*m^2+(-1/5)*m-5 = 0
27*m^2-1/5*m-5 = 0
DELTA = (-1/5)^2-(-5*4*27)
DELTA = 13501/25
DELTA > 0
m = ((13501/25)^(1/2)+1/5)/(2*27) or m = (1/5-(13501/25)^(1/2))/(2*27)
m = ((13501/25)^(1/2)+1/5)/54 or m = (1/5-(13501/25)^(1/2))/54
m in { (1/5-(13501/25)^(1/2))/54, ((13501/25)^(1/2)+1/5)/54 }
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