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D( x )
16-(4*x) = 0
16-(4*x) = 0
16-(4*x) = 0
16-4*x = 0
16-4*x = 0 // - 16
-4*x = -16 // : -4
x = -16/(-4)
x = 4
x in (-oo:4) U (4:+oo)
(3*x-12)/(16-(4*x)) = 0
(3*x-12)/(16-4*x) = 0
3*x-12 = 0 // + 12
3*x = 12 // : 3
x = 12/3
x = 4
x in { 4}
x belongs to the empty set
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