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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
1/c+3 = 7/42 // - 7/42
1/c-(7/42)+3 = 0
1/c-1/6+3 = 0
1*c^-1 = -17/6 // : 1
c^-1 = -17/6
-1 < 0
1/(c^1) = -17/6 // * c^1
1 = -17/6*c^1 // : -17/6
-6/17 = c^1
c = -6/17
c = -6/17
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