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