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