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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
7/4 = 6/c-2 // - 6/c-2
7/4-(6/c)+2 = 0
7/4-6*c^-1+2 = 0
-6*c^-1 = -15/4 // : -6
c^-1 = 5/8
-1 < 0
1/(c^1) = 5/8 // * c^1
1 = 5/8*c^1 // : 5/8
8/5 = c^1
c = 8/5
c = 8/5
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