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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
(11/3)*c-c+1/c+4+12 = c/3 // - c/3
(11/3)*c-c-(c/3)+1/c+4+12 = 0
7/3*c^1+1*c^-1+16*c^0 = 0
(7/3*c^2+16*c^1+1*c^0)/(c^1) = 0 // * c^2
c^1*(7/3*c^2+16*c^1+1*c^0) = 0
c^1
(7/3)*c^2+16*c+1 = 0
(7/3)*c^2+16*c+1 = 0
DELTA = 16^2-(1*4*(7/3))
DELTA = 740/3
DELTA > 0
c = ((740/3)^(1/2)-16)/(2*(7/3)) or c = (-(740/3)^(1/2)-16)/(2*(7/3))
c = 3/14*((740/3)^(1/2)-16) or c = -3/14*((740/3)^(1/2)+16)
c in { -3/14*((740/3)^(1/2)+16), 3/14*((740/3)^(1/2)-16)}
c in { -3/14*((740/3)^(1/2)+16), 3/14*((740/3)^(1/2)-16) }
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