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D( x )
5-(3*x) = 0
5-(3*x) = 0
5-(3*x) = 0
5-3*x = 0
5-3*x = 0 // - 5
-3*x = -5 // : -3
x = -5/(-3)
x = 5/3
x in (-oo:5/3) U (5/3:+oo)
4/(5-(3*x)) < 0
4/(5-3*x) < 0
( 4 )
4 < 0
x belongs to the empty set
( 5-3*x )
5-3*x < 0 // - 5
-3*x < -5 // : -3
x > -5/(-3)
x > 5/3
(-oo:5/3) (5/3:+oo) 4 + + 5-3*x + -
x in (5/3:+oo)
(5/3:+oo)
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