find the set of all natural numbers X such that 4 x + 9 less than 30
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x = 0, 1, 2, 3, 4, 5
x=0
4*0+9=9
x= 1
4*1+9= 13
x=2
4*2+9= 17
x=3
4*3+9= 21
x= 4
4*4+9= 25
x=5
4*5+9= 29
x=0
4*0+9=9
x= 1
4*1+9= 13
x=2
4*2+9= 17
x=3
4*3+9= 21
x= 4
4*4+9= 25
x=5
4*5+9= 29
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