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D( x )
8*x-16 = 0
8*x-16 = 0
8*x-16 = 0
8*x-16 = 0 // + 16
8*x = 16 // : 8
x = 16/8
x = 2
x in (-oo:2) U (2:+oo)
((4*x)/9)*((3*x-6)/(8*x-16)) = 0
(4/9*x*(3*x-6))/(8*x-16) = 0
( 3*x-6 )
3*x-6 = 0 // + 6
3*x = 6 // : 3
x = 6/3
x = 2
( 4/9*x )
4/9*x = 0 // : 4/9
x = 0
x in { 2}
x = 0
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