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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
18/c = 2/7 // - 2/7
18/c-(2/7) = 0
18/c-2/7 = 0
18*c^-1 = 2/7 // : 18
c^-1 = 1/63
-1 < 0
1/(c^1) = 1/63 // * c^1
1 = 1/63*c^1 // : 1/63
63 = c^1
c = 63
c = 63
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