B={x:x€N , 3x - 6<9}
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3x-6 <9
if x=2, 3X=6
And 3x-6=0 it's <9
if x=1 3x-6= -3. it's <9
if x=6 , 3x-6=12. it's >9
X=[1,2,3,4,5]
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