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x in (-oo:+oo)
x*((x-3)/3) < 0
(x*(x-3))/3 < 0
( 3 )
3 < 0
x belongs to the empty set
( x-3 )
x-3 < 0 // + 3
x < 3
( x )
x+0 < 0 // - 0
x < 0
(-oo:0) (0:3) (3:+oo) 3 + + + x-3 - - + x - + +
x in (0:3)
(0:3)
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