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D( x )
6-(3*x) = 0
6-(3*x) = 0
6-(3*x) = 0
6-3*x = 0
6-3*x = 0 // - 6
-3*x = -6 // : -3
x = -6/(-3)
x = 2
x in (-oo:2) U (2:+oo)
(4-x)/(6-(3*x)) < 0
(4-x)/(6-3*x) < 0
( 4-x )
4-x < 0
-x < -4 // * -1
x > 4
( 6-3*x )
6-3*x < 0 // - 6
-3*x < -6 // : -3
x > -6/(-3)
x > 2
(-oo:2) (2:4) (4:+oo) 4-x + + - 6-3*x + - -
x in (2:4)
(2:4)
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