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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
2/c+6 = -2 // + 2
2/c+2+6 = 0
2*c^-1 = -8 // : 2
c^-1 = -4
-1 < 0
1/(c^1) = -4 // * c^1
1 = -4*c^1 // : -4
-1/4 = c^1
c = -1/4
c = -1/4
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