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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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