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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
12/36 = 4/c // - 4/c
12/36-(4/c) = 0
12/36-4*c^-1 = 0
-4*c^-1 = -1/3 // : -4
c^-1 = 1/12
-1 < 0
1/(c^1) = 1/12 // * c^1
1 = 1/12*c^1 // : 1/12
12 = c^1
c = 12
c = 12
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