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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
c+1/c-2 = 4/7 // - 4/7
c+1/c-(4/7)-2 = 0
c+1/c-4/7-2 = 0
1*c^1+1*c^-1-18/7*c^0 = 0
(1*c^2-18/7*c^1+1*c^0)/(c^1) = 0 // * c^2
c^1*(1*c^2-18/7*c^1+1*c^0) = 0
c^1
c^2+(-18/7)*c+1 = 0
c^2+(-18/7)*c+1 = 0
DELTA = (-18/7)^2-(1*1*4)
DELTA = 128/49
DELTA > 0
c = ((128/49)^(1/2)-(-18/7))/(1*2) or c = (-(-18/7)-(128/49)^(1/2))/(1*2)
c = ((128/49)^(1/2)+18/7)/2 or c = (18/7-(128/49)^(1/2))/2
c in { (18/7-(128/49)^(1/2))/2, ((128/49)^(1/2)+18/7)/2}
c in { (18/7-(128/49)^(1/2))/2, ((128/49)^(1/2)+18/7)/2 }
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