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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
10/5 = 12/c // - 12/c
10/5-(12/c) = 0
10/5-12*c^-1 = 0
-12*c^-1 = -2 // : -12
c^-1 = 1/6
-1 < 0
1/(c^1) = 1/6 // * c^1
1 = 1/6*c^1 // : 1/6
6 = c^1
c = 6
c = 6
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