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D( x )
4-(6*x) = 0
4-(6*x) = 0
4-(6*x) = 0
4-6*x = 0
4-6*x = 0 // - 4
-6*x = -4 // : -6
x = -4/(-6)
x = 2/3
x in (-oo:2/3) U (2/3:+oo)
8/(4-(6*x)) < 0
8/(4-6*x) < 0
( 4-6*x )
4-6*x < 0 // - 4
-6*x < -4 // : -6
x > -4/(-6)
x > 2/3
( 8 )
8 < 0
x belongs to the empty set
(-oo:2/3) (2/3:+oo) 4-6*x + - 8 + +
x in (2/3:+oo)
(2/3:+oo)
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