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D( c )
c+1 = 0
c+1 = 0
c+1 = 0
c+1 = 0 // - 1
c = -1
c in (-oo:-1) U (-1:+oo)
(6*c^2+3*c-3)/(c+1) = 0
6*c^2+3*c-3 = 0
3*(2*c^2+c-1) = 0
2*c^2+c-1 = 0
DELTA = 1^2-(-1*2*4)
DELTA = 9
DELTA > 0
c = (9^(1/2)-1)/(2*2) or c = (-9^(1/2)-1)/(2*2)
c = 1/2 or c = -1
3*(c+1)*(c-1/2) = 0
3*(c-1/2) = 0
c-1/2 = 0 // + 1/2
c = 1/2
c = 1/2
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