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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
20/c = 16/12 // - 16/12
20/c-(16/12) = 0
20/c-4/3 = 0
20*c^-1 = 4/3 // : 20
c^-1 = 1/15
-1 < 0
1/(c^1) = 1/15 // * c^1
1 = 1/15*c^1 // : 1/15
15 = c^1
c = 15
c = 15
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