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D( x )
x^2 = 0
x^2 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
(3*x)/(x^2)-36 = 0
3*x^-1 = 36 // : 3
x^-1 = 12
-1 < 0
1/(x^1) = 12 // * x^1
1 = 12*x^1 // : 12
1/12 = x^1
x = 1/12
x = 1/12
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