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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
-36 = 2/x // - 2/x
-(2/x)-36 = 0
-2*x^-1-36 = 0
-2*x^-1 = 36 // : -2
x^-1 = -18
-1 < 0
1/(x^1) = -18 // * x^1
1 = -18*x^1 // : -18
-1/18 = x^1
x = -1/18
x = -1/18
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