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D( c )
c^2-9 = 0
c-3 = 0
c^2-9 = 0
c^2-9 = 0
1*c^2 = 9 // : 1
c^2 = 9
c^2 = 9 // ^ 1/2
abs(c) = 3
c = 3 or c = -3
c-3 = 0
c-3 = 0
c-3 = 0 // + 3
c = 3
c in (-oo:-3) U (-3:3) U (3:+oo)
6/(c-3) = (c+3)/(c^2-9)-5 // - (c+3)/(c^2-9)-5
6/(c-3)-((c+3)/(c^2-9))+5 = 0
6/(c-3)+(-1*(c+3))/(c^2-9)+5 = 0
(6*(c^2-9))/((c-3)*(c^2-9))+(-1*(c+3)*(c-3))/((c-3)*(c^2-9))+(5*(c-3)*(c^2-9))/((c-3)*(c^2-9)) = 0
6*(c^2-9)-1*(c+3)*(c-3)+5*(c-3)*(c^2-9) = 0
5*c^3+5*c^2-15*c^2-45*c-45+135 = 0
5*c^3-10*c^2-45*c+90 = 0
5*c^3-10*c^2-45*c+90 = 0
5*(c^3-2*c^2-9*c+18) = 0
c^3-2*c^2-9*c+18 = 0
{ 1, -1, 2, -2, 3, -3, 6, -6, 9, -9, 18, -18 }
1
c = 1
c^3-2*c^2-9*c+18 = 8
1
-1
c = -1
c^3-2*c^2-9*c+18 = 24
-1
2
c = 2
c^3-2*c^2-9*c+18 = 0
2
c-2
c^2-9
c^3-2*c^2-9*c+18
c-2
2*c^2-c^3
18-9*c
9*c-18
0
c^2-9 = 0
DELTA = 0^2-(-9*1*4)
DELTA = 36
DELTA > 0
c = (36^(1/2)+0)/(1*2) or c = (0-36^(1/2))/(1*2)
c = 3 or c = -3
c in { -3, 3, 2}
5*(c+3)*(c-3)*(c-2) = 0
(5*(c+3)*(c-3)*(c-2))/((c-3)*(c^2-9)) = 0
(5*(c+3)*(c-3)*(c-2))/((c-3)*(c^2-9)) = 0 // * (c-3)*(c^2-9)
5*(c+3)*(c-3)*(c-2) = 0
( c+3 )
c+3 = 0 // - 3
c = -3
( c-2 )
c-2 = 0 // + 2
c = 2
( c-3 )
c-3 = 0 // + 3
c = 3
c in { -3}
c in { 3}
c = 2
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