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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
36/x = 12/2 // - 12/2
36/x-(12/2) = 0
36/x-6 = 0
36*x^-1 = 6 // : 36
x^-1 = 1/6
-1 < 0
1/(x^1) = 1/6 // * x^1
1 = 1/6*x^1 // : 1/6
6 = x^1
x = 6
x = 6
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