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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4/x = 36 // - 36
4/x-36 = 0
4*x^-1 = 36 // : 4
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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