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D( x )
4*x-16 = 0
4*x-16 = 0
4*x-16 = 0
4*x-16 = 0 // + 16
4*x = 16 // : 4
x = 16/4
x = 4
x in (-oo:4) U (4:+oo)
(2*x^2-32)/(4*x-16) = 0
2*x^2 = 32 // : 2
x^2 = 16
x^2 = 16 // ^ 1/2
abs(x) = 4
x = 4 or x = -4
x in { 4}
x = -4
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