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c in (-oo:+oo)
c^2+(5/6)*c = -1/6 // + -1/6
c^2+(5/6)*c-(-1/6) = 0
c^2+(5/6)*c+1/6 = 0
c^2+5/6*c+1/6 = 0
DELTA = (5/6)^2-(1/6*1*4)
DELTA = 1/36
DELTA > 0
c = ((1/36)^(1/2)-5/6)/(1*2) or c = (-(1/36)^(1/2)-5/6)/(1*2)
c = -1/3 or c = -1/2
c in { -1/2, -1/3 }
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