Write in roster form {x: x is an integer 2 x+1 <10 }
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Take all negetive numbers,0,1,2,3 and 4 as for the substitute of x
2(-1)+1=-1
2(0)+1=1
2(1)+1=3
2(2)+1=5
2(3)+1=7
2(4)+1=9
(-infinite,.....,1,3,5,7,9)
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