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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
X-(1/x) = 30 // - 30
X-(1/x)-30 = 0
X-x^-1-30 = 0
-1*x^-1 = -(X-30) // : -1
x^-1 = X-30
-1 < 0
1/(x^1) = X-30 // * x^1
1 = x^1*(X-30) // : X-30
1/(X-30) = x^1
x = 1/(X-30)
x = 1/(X-30)
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