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D( x )
x^2-36 = 0
x^2-36 = 0
x^2-36 = 0
1*x^2 = 36 // : 1
x^2 = 36
x^2 = 36 // ^ 1/2
abs(x) = 6
x = 6 or x = -6
x in (-oo:-6) U (-6:6) U (6:+oo)
(x^2-(6*x))/(x^2-36) = 0
(x^2-6*x)/(x^2-36) = 0
x^2-6*x = 0
x*(x-6) = 0
x-6 = 0 // + 6
x = 6
x*(x-6) = 0
(x*(x-6))/(x^2-36) = 0
( x-6 )
x-6 = 0 // + 6
x = 6
( x )
x = 0
x in { 6}
x = 0
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