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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
9 = 72/c // - 72/c
9-(72/c) = 0
9-72*c^-1 = 0
-72*c^-1 = -9 // : -72
c^-1 = 1/8
-1 < 0
1/(c^1) = 1/8 // * c^1
1 = 1/8*c^1 // : 1/8
8 = c^1
c = 8
c = 8
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