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D( x )
(4*x-16)/2 <= 0
(4*x-16)/2 <= 0
(4*x-16)/2 <= 0
( 2 )
2 <= 0
x belongs to the empty set
( 4*x-16 )
4*x-16 <= 0 // + 16
4*x <= 16 // : 4
x <= 16/4
x <= 4
(-oo:4) (4:+oo) 2 + + 4*x-16 - +
x in (4:+oo)
ln((4*x-16)/2) = 0
ln((4*x-16)/2) = ln(e^0)
(4*x-16)/2 = e^0
(4*x-16)/2-e^0 = 0
(4*x-16)/2-1 = 0
(4*x-16)/2+(-1*2)/2 = 0
4*x-1*2-16 = 0
4*x-18 = 0
(4*x-18)/2 = 0
(4*x-18)/2 = 0 // * 2
4*x-18 = 0
4*x-18 = 0 // + 18
4*x = 18 // : 4
x = 18/4
x = 9/2
x = 9/2
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