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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
12/c = 4/3 // - 4/3
12/c-(4/3) = 0
12/c-4/3 = 0
12*c^-1 = 4/3 // : 12
c^-1 = 1/9
-1 < 0
1/(c^1) = 1/9 // * c^1
1 = 1/9*c^1 // : 1/9
9 = c^1
c = 9
c = 9
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