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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
42/c = 6 // - 6
42/c-6 = 0
42*c^-1 = 6 // : 42
c^-1 = 1/7
-1 < 0
1/(c^1) = 1/7 // * c^1
1 = 1/7*c^1 // : 1/7
7 = c^1
c = 7
c = 7
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