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