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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
((7*c)/2)*c-(((3*c)/3)*c)+(c^2)/c-10-6-5 = 0
((7*c)/2)*c-c^2+(c^2)/c-10-6-5 = 0
5/2*c^2+c-21 = 0
DELTA = 1^2-(-21*5/2*4)
DELTA = 211
DELTA > 0
c = (211^(1/2)-1)/(2*5/2) or c = (-211^(1/2)-1)/(2*5/2)
c = (211^(1/2)-1)/5 or c = (-(211^(1/2)+1))/5
c in { (-(211^(1/2)+1))/5, (211^(1/2)-1)/5 }
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