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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(16*(x^2-36))/x = 0
( 16 )
16 = 0
x belongs to the empty set
( x^2-36 )
1*x^2 = 36 // : 1
x^2 = 36
x^2 = 36 // ^ 1/2
abs(x) = 6
x = 6 or x = -6
x in { 6, -6 }
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