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D( x )
3*x = 0
3*x = 0
3*x = 0
3*x = 0 // : 3
x = 0
x in (-oo:0) U (0:+oo)
(x-3)/(3*x) > 0
( 3*x )
3*x+0 > 0 // - 0
3*x > 0 // : 3
x > 0/3
x > 0
( x-3 )
x-3 > 0 // + 3
x > 3
(-oo:0) (0:3) (3:+oo) 3*x - + + x-3 - - +
x in (-oo:0) U (3:+oo)
(-oo:0) U (3:+oo)
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