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