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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
14/28 = 5/c // - 5/c
14/28-(5/c) = 0
14/28-5*c^-1 = 0
-5*c^-1 = -1/2 // : -5
c^-1 = 1/10
-1 < 0
1/(c^1) = 1/10 // * c^1
1 = 1/10*c^1 // : 1/10
10 = c^1
c = 10
c = 10
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