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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
5/c = 8/15 // - 8/15
5/c-(8/15) = 0
5/c-8/15 = 0
5*c^-1 = 8/15 // : 5
c^-1 = 8/75
-1 < 0
1/(c^1) = 8/75 // * c^1
1 = 8/75*c^1 // : 8/75
75/8 = c^1
c = 75/8
c = 75/8
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